User Manual

NP Maps, Topo Reader, and Topo Nomad iOS apps


These apps allows you to easily download official National Park Service(NPS) and US Geological Survey(USGS) topographic maps for GPS* and offline use.

NP Maps app: Freemium app for downloading NPS maps of the USA and 24K scale USGS maps. A subscription period allows downloading all available maps and stops banner ads. Maps retain full use even after subscription period ends.

Topo Reader app: Freemium app for downloading all historical and current 24K, 25K, 100K, 250K scale USGS maps. A subscription period allows downloading all available maps and stops banner ads. Maps remain for full use even after subscription period ends.

Topo Nomad app: Same as Topo Reader app but is not freemium. It is a one-time purchase that never requires a subscription and does not run banner ads. It imports geopdf maps, PDF files with embedded geospatial metadata.

Getting Started

Explore the app and plan about downloading additional maps you may need for offline use before you travel to regions without data service.

Use the familiar Apple Maps touch gestures for repositioning and zooming the map to your desired location. Touch with one finger and immediately drag it to move the map view. Using two fingers, touch and pinch outward and inward to zoom in and out, or to rotate the map orientation. A double tap using one finger zooms in 2X. A two finger double tap zooms out 2X.

Touch and hold a point on the reference map for one second to begin your selection of National Park Service(NP Maps) and USGS topographic map selection for download.

Select and Download Maps

The Topo Nomad and Topo Reader apps index the USGS map sets, while the NP Maps app include indexes for the USA Nationa Park Service maps and subset of the USGS. The map indexes are displayed as quadrangle outlines for download selecting. (For maps outside the USA, see section "Importing Maps & GPX Files")

Zoom out until the colored grid of maps outlines appear, referred to as the map footprints. The map quadrangle name and state will appear in the footprint index when zoomed in for legible text. (Also, zoom in if viewing at state or country level)

Tap the name label of the map quadrangle, or touch and hold a footprint for a second to enable the map download selection mode. The Download and Cancel button platter will appear on top. Select up to 25 footprints by sliding your finger in a path or by single tapping. Unselect a footprint by tapping it.

Note: Map selection is disabled when zoomed out significantly, and the footprint grid is made invisible when the map view is rotated (if the orientation compass is shown in the upper right corner).

Tap Download on the button plater to begin the process, or tap Cancel to exit.

National Park Service index footprints are color coded by park type: Green - National park, Purple - Historical site, Gold - National recreation area, Yellow - Preserve/Reserve, Blue - Seashore, Cyan - Monument, Olive - NPS/FS/NRCan topography map, Light Blue - Scenic river/Parkway. The USGS map footprint color is bluish-green and may vary by state.

If a larger map footprint is layered on top of smaller ones, tap at the same point to toggle the selection from the smallest to largest map selection. A continuous path touch selects the smallest scaled maps.

Two internet connections queue the maps in the same order as selected. You can prioritize maps to the front of the queue by selecting them again and touching Download. This can be desirable on slow network connections.

To bring up a table of available topography maps for a particular location, touch and hold for 4 seconds a location on the map.

For example, a 4 second long touch at 42°56'N 122°08'W would show:

Checkmark desired maps and press the button to queue the download.

Subscription (Topo Reader & NP Maps apps)

Purchasing a subscription period allows for downloading and installing any number of maps. A purchase stops banner advertisments permentantly (except import features). And, enables the export and your GPS waypoints, tracks and routes over email and SMS text in GPX file format. The free mode of this app allows for a limited a number of maps to be downloaded and installed which is the sum of all maps shared between this app and its app family of proliferations such as Topo Reader, NP Maps, NP Maps Yellowstone and so. Subscriptions do not autorenew, no cancellation needed. Maps remain fully functional after the subscription period ends. Ads remain stopped after expiration, unless if the import feature is used then they return. The subscription period is shared between your Apple devices and the app versions if the iCloud drive is enabled. Repurchased subscriptions extend from the expiration date of an active subscription.

Subscription status and expiration date will appear in the subscription menu after a purchase had been made. The expire hour is midnight of the locale time. If the device was restored or is a new IOS device, purchase receipts can be reprocessed from an iTunes account by taping the "Restore Prior Purchases" button at the bottom of the subscription menu. If the "Restore Prior Purchases" button is not visible, tap the menu title "Buy Full Download Access" to unhide it. The iCloud drive should be on to share the subscription between other IOS devices using the same iTunes account. A purchase can be made with the iCloud drive off. To sync the purchase with other devices, turn on the iCloud drive in the "Settings" app and then restore prior purchases to update the device expiration data on the iCloud. Devices sharing this subscription should see the new date. If not, then run restore prior purchases on them after running the restore on the device the purchase was made. Internet service is needed for iCloud to work. In the free mode (non-active subscription), existing installed maps can be swapped out for another, one at a time, by deleting one followed by selecting and downloading another. A limited number of swaps are allowed during within a time frame (about an hour). A subscription does not change the download queue size. Map data is not backed up, app store submission restriction, and a subscription repurchase may be necessary to restore prior downloads.

Downloading Status

A footprint will display the four modes and progress to install a Topographic map. Two more statuses may appear due to network interruption and server access.

Download Queued and Progressing

Data Downloaded

Rasterizing map image
(Peripheral maps may blur during this process)

Map Installed
Violet thumbnail when zoomed out

No network connection or internet access
Resumes download when connected /w 5 minute timeout

Server error
Retries every 20 seconds /w 5 minute timeout

Data is unpacked one map at a time so not to overload memory resources.

Note: While rasterizing map images (done for pan and zoom performance), peripheral maps may blur in low-resolution to free cpu memory for this rendering process. If iOS issues a memory warning, the app may pop up an alert and zoom out and unload images to avert a memory crash. If this memory alert occurs you can zoom in and continue using the app. This alert action won't occur after all maps are rasterized and installed.

Coordinates Display and Entering a Coordinate

Three latitude and longitude coordinate formats are supported:




Touch and hold for one second to set coordinates. Coordinates are based on the WGS84 datum(GPS). Minutes and seconds can be specified with the ' and " suffix or separated by a space. Both latitude and longitude need to use the same format:

Latitude and longitude value can be suffixed with N or S and E or W respectively while delimited by whitespace or these ,'" ° characters. The parser algorithm counts the number of numbers to determine the format typed in. For example, to enter a coordinate with latitude: 34°1'54.8" and longitude: -116°8'0.0", you can type in 34 1 54.8,-116 8 0. The parser latitude as the left number followed by the longitude coordinate on the right. If reversed, use the hemisphere N S E and W suffixes, for example, 116 8 0w 34 1 54.8n and the parser will recognize longitude was entered before latitude.

The button retracts and hides the coordinates, crosshairs, and ruler if in use. It then flips as the button to unhide.

Distance Key and Changing Units

The distance key become transparent when map motions stops. Touching the key will unhide it. In far North and far South latitudes the key bases distance off the center of the map view, not the upper left location where the key is drawn.

Tap the distance key when unhidden to change between metric and US Customary units used throughout the app. The units alternate in this order:

Statute Miles




Nautical Miles

GPS Location and Elevation

Location services are automatically enabled upon app start up. IOS devices without GPS capabilities such as WiFi only iPad and iPod devices may receive low accuracy location services though WiFi connections. Taping the location service button controls turning on, off, and centering the map to your current location. The button indicates five(5) possible location statuses:

Location services off. Track recording disabled if on.
Saves battery power.

Location services on.
Tracking current location at map center.
GPS Elevation is shown right of coordinates, orient iPhones sideways in landscape to view. Waypoints dropped in this mode record elevation.
Devices with a compass show a black "N" orienting the arrow true North. The example below shows the user facing South. The "N" will flash if the accuracy of the compass sensors is very broad (over 60°).

Location services on.
Map not centered on current location.
Elevation reading is not shown and waypoint don't record elevation.

Reacquiring GPS signal. A location update hasn't been received for several seconds. A forest canopy or entering a building can cause signal loss.

Location services not available.
Airplane mode was turned on, or loss of GPS and WiFi signal.

No location data.
Location reading is stale and has not been updated for over a minute. Entering a large building or parking garage, and a cave or forest may do this.

The location ± accuracy is in feet or in meters if the distance key is selected to metric units.

Note: Location services draw extra current when on and will shorten battery use time.

Location Indicator

When location services are enabled your current location is shown by this dot:

User location. This shows a user's iPhone facing a true heading of 90°E. The N points to North found on the map image, when displayed.

User location. Map mode is tracking user's heading. The N points to the user's true North, when displayed. To enter this mode, turn on GPS location then press and hold for 1 second the button to toggle between this mode and normal track location mode.

User location on a device without compass capabilities. The points to map true North, when displayed.

Note about flip cases: Magnets may be embedded in some device cases which can cause erroneous heading and compass readings. Remove from case for better sensor readings.


The ruler is toggled on and off by tapping the center of the crosshairs . The center turns green while the ruler is on . The ruler draws the distance from where its was initially enabled, the red dot , to the location the map is scrolled to. A radius circle is drawn around the initial point while in the "line" mode. The "path" mode show a dot line to the origin location. The path can be erased by carefully backing up the center dot, which will turn red, on the most previous segment.

Tap the center dot to turn off the ruler. If turned off accidentally, quickly tap the center dot again before the ruler fades and loses its information.

Ruler controls are:

Units - Tap the distance key to change the ruler units of measurement.

Path & Line Ruler modes - Touch and hold the screen for 1 second to toggle between the path ruler and line ruler modes.

Below is an example of the line ruler:

Below is an example of the path ruler:

The rule path mode will show the "Save Route" and "No" buttons to save the ruler as a route or not. Tapping Save Route will ask for a route name, or No to hide to buttons.

The ruler calculates the Earth orthodromic distance, the path of shortest spherical distance. The radius circle and the ruler lines are drawn as estimations and are not accurate radial and spherical path projections.

Back Button

Tap the back arrow button to enable it if dimmed. This arrow backs through the map "camera" view history. The history limit is 3 by default and can be changed in "Settings" app- [app name] ->"History Count:". Setting the count limit to 0 will disable and hide the back arrow, maximum is 99.

When backing through the history, the history count appears next to the arrow, . The arrow reverses direction and will double back when the end count is reached. The button becomes a red shade in color in the double back mode, .

Pressing and holding the back arrow button for 1 second will toggle the direction (touching the arrow and sliding your finger away will do the same).

Moving the map will record the current map camera view. If the follow user location mode is enabled (tracking current location), only the first and last locations are recorded into the history. Tapping the back arrow will disable the follow user mode and record the last location. The mode is also stopped by moving the map or turning off location services.


Add a waypoint from the settings menu by taping the Add waypoint button. A new point is dropped at the map center with a popup callout:

The waypoint is given a placeholder name and an incrementing number shown as “Waypoint 1” here. If location service is on and tracking then elevation is logged into the waypoint data. Tap the information button to reveal elevation and notes. All of these fields can be edited when touched. Modifying the coordinate values significantly may cause the waypoint to vanish off the screen to the new location. Another waypoint cannot be added until the map is moved. Touching a waypoint pops out is callout. Changes to coordinate, elevation and name must be saved using the RETURN key, otherwise ignored. Tapping outside the callout view saves notes entries since a return is logged as a carriage return. However, tapping outside the callout view discards changes on other fields (name, coordinates or elevation).

The waypoint notes support HTML formatted text or a web link to the text. HTML formatted text requires the first characters to be <HTML or <!. For a web link, the first characters must be HTTP: or HTTPS: and may require internet service to view.

Waypoint data is stored in the GPS Exchange Format. The files can be uploaded and downloaded using iTunes on a Mac or PC under the IOS Device Apps tab in the File Sharing category inside the 'Waypoints' folder. Each file is a waypoint group.

Note about adding waypoints while recording routes or tracks:
If you add a waypoint while building a route path, a new waypoint group is created and tagged with a prefix of "ROUTE: " in its name. Likewise for tracks, but, while viewing the current recording track path and only if the GPS is homed to following your current location, then adding a waypoint is put into a group named "TRACK: " appended the track name. Deleting a track or route will remove its corresponding waypoints group; if you need to keep those waypoints but delete the track/route, then first rename its waypoint group to disassociate it.

Waypoints Menu

Waypoints can be listed in the menu by distance from the map center or alphabetically by name. To center the map on a waypoint, double tap the waypoint table row. Waypoint groups are created by the addition button . A group must be give a name to create it. New waypoints are added to this group. Renaming a group is done by touching and holding for 2 seconds the group name header. If the new name matches an existing group then the two groups have the waypoints merged. Double tapping the group name selects that group for the addition of new waypoints. Tapping the triangle toggles hiding the list of waypoints. The switch hides the group waypoints from being shown on the maps. Tapping a waypoint symbol allows you to change its symbol and makes that symbol the default for new waypoints. Changing a waypoint to another group is not an implemented feature.

The AR button presents an augmented reality camera view for the waypoints. The slider at the bottom reduces the viewable distance of waypoints if too many are cluttering on the horizon. Five sensors mesh to create this feature. The sensors can be uncalibrated or getting bad readings so don't trust the direction or location of the waypoint objects. This is a "gimmick" feature, do not use for navigating or for direction. iPods and iPads without GPS don't have this AR feature.

Routes and Tracks

Routes and Tracks can be created and viewed from this menu.

A track records a trail of your current GPS locations from when track recording is turned on until turned off. When on, a track is recorded in the background while not using the app. Be aware that this may draw slightly more power from the battery even when the device is in sleep mode. The default name is "Track" with the date and time. The new track name is created and shown in red on top of the list. When turned off the current track name is retained for a few seconds incase off was not wanted. Then the "Track Recording OFF" will transition from red to white when a new track can be started. If the GPS is turned off for over 1 minute, the track recording will be stopped. Track recording is also turned off by terminating the app (double press the device home button and swipe the app image upward).

Note: The GPS and track recording may automatically turn off if the device location has not moved for a period of time. This is done by the IOS to save battery power and track recording may need to be switched back on.

A Route allows you to create and save a path image on a map. Tap the Create Route button to start the path from the current center of the map. Be sure that the center of the map cross hairs are positioned at the path start before creating. The app will leave the menu and resume to the maps view. Touch and move the map view to draw the route. A button platter will be visible to save the route or cancel it. Route are logged as point for each distance segment with orange dots. Zooming in and out or changing the units will affect the segment lengths on added route points. Carefully following backwards on a route will erase segments.

To view a track or route, double tap on the name.

To change the name, press and hold for a second the route or track name. If the name matches another, then the two routes or two tracks are merged. Track are scanned for timestamps and append older with latest. Route path merge by appending the newly renamed route to an existing named route.

To hide and end viewing a route or track on a map, tap its floating name and distance label. Only one track or route can be view at a time. Track and routes that are segmented (GPS was temporarily off) less than 1 mile or 1 km are joined.

Deleting Waypoints

Delete waypoints from the Waypoints table in the settings menu. Waypoints are sorted by distance from the current map center location. Left swipe a waypoint entry to reveal the delete button, or alternatively select the Edit button for bulk delete. And entire group of waypoints can be deleted by left swiping the group name header which will prompt before doing so. Also, at the bottom of the table is a Delete All Waypoints... option. Delete cannot be undone. Waypoints are backed up if your device is backed up to iTunes or the iCloud.


In the Settings menu tap the button to bring up the geocoding search bar. Geocoding searches are performed over the internet and will reposition the map region to the selected search result coordinate.

Deleting and Managing Maps

Deleting topographic maps from storage is done either from the Maps table found in settings Maps or by touching and holding a point for 4 seconds to reveal the Available Maps table at that coordinate. In these tables, tap the Edit button in the upper right corner and select the maps and confirm delete, or alternatively you can swipe the map listing left to reveal the delete button.

Maps in the Maps table are sorted by distance from the map center and sectioned ascending by scale as default. At the top of the table are three sorting options: by scale group (ascending, descending, none), distance, and name.

Maps in the Available Maps table are sorted by date and sectioned by ascending scale.

Hidden Maps

The purple ring in the crosshairs indicates one or more maps are hidden at that coordinate.

The blue ring in the crosshairs indicates a smaller and higher detailed topo map is below the larger scale map shown. Zooming in will reveal the smaller map.

Touch and hold for 4 seconds on that point to bring up the table of maps for controlling map hidden attributes. Multiple versions of the same map can have only one version visible and the others are automatically hidden. Hidden attributes are,

Map is hidden (Topographic Maps table)

Map is hidden, tap to unhide

Map is visible, tap to make hidden

For same scale map versions the latest map defaults as unhidden, the others hidden. The Settings controls will reveal the button Clear Hidden Map Selections to reset to hidden map defaults if any hidden attributes were changed.

Touch Gestures

There are three swipe gestures for hiding and unhiding maps using two fingers. Acts on the maps at the touched mid point.

TWO FINGER SWIPE LEFT or RIGHT - Hides the displayed map at the touch points, and, unhides all if all hidden there.

TWO FINGER SWIPE UP - Hides the displayed map and reveals the next older map version from smallest scale to largest, and, unhides the latest versions if all hidden.

TWO FINGER SWIPE DOWN - Reverse of two finger swipe up. Unhides the next newer hidden map version. No action taken if the latest versions are shown.

TRIPLE TAP - Hides all controls for fullscreen map view. Tap the triangle button in top right corner the exit this mode, or rotate the device. On iPhones, shaking the device will also enter fullscreen map view mode.

TWO FINGER LONG PRESS - Changes the map boarder crop-margins mode.


Automatic Map Download - When on, automatically downloads the topographic map for your current location. The location check is done every two minutes. Default is on.

Park Map Footprints, Topography Map Footprints - Shows the catalog of topographical maps available for selection download. When off, hides the footprint overlay and drawing performance may improve. Default is on.

Map Opacity - A slide control for the topographic maps transparency to see through to the reference Apple Map layer. Set to 0% to hides the topographical maps. Default it 100% opaque.

Crop Margins - Hides the boarders of the topographic map images which show the map key and USGS information. When set to Yes, the boarders are cut around the map so that adjacent maps will appear stitched together. The Auto mode automatically removes boarder margins when an adjacent map is in view. When set to No the clipping is off and the margins are always shown. The map in the center crosshairs is brought to the front of the map stack. Default mode is Auto. A TWO-FINGER PRESS HOLD for 1 second on the map transitions these modes.

Datum - The datum is the reference model of the Earth used to determine the coordinate values. The default setting is GPS which is the WGS84 datum. The NAD27 is the North American Datum of 1927 which a majority of USGS historical maps are based on. Recent USGS maps may use NAD83. This app handles the NAD83 datum as equivalent to WGS84. The Maps's setting displays the coordinate values based off the datum of the topographic map in the center crosshairs. In this mode the coordinate values match what is printed on the topographic map. If you are recording or sharing coordinate locations with others, unless otherwise instructed, it is recommended to use datum mode GPS (WGS84) and make note of the datum as WGS84 as this is one of the more universal and recent datum models. If the coordinates field and crosshairs are not hidden, the datum being used is shown in small font right of the coordinates. It may show WGS84, NAD27, NAD83, OHA, PUR, GUA for World Geodetic System 1984, North American Datum of 1927, North American Datum 1983, Old Hawaiian, Puerto Rico datum, and Guam datums respectively. Other datum acronyms may appear not listed here.

Reference Map Type - The map mode for the background Apple map layer. Default is Standard which is the graphics drawn road map. The Hybrid setting draws satellite aerial image with road overlay graphics. And, Satellite for just the aerial map.

Map Storage Used: - Bytes used by this app for storing downloaded map images and data.

Reset to Default Settings - Sets the above settings to the default values. No other states in the app are changed.

Clear Hidden Map Selections - If a topographic map was made hidden or an older map version unhidden then this button becomes visible. It resets all hidden maps settings to the defaults of revealing the latest map versions.

Sync \ Restore Maps

For restoring downloaded maps on a new iOS device or to synchronize installed maps between devices or to recover just deleted maps, use the Sync \ Restore button is found in the settings menu Maps table. Scroll down to the bottom of the list of maps. If the Sync \ Restore button is showing, then tapping this button will show a list of your devices from which maps can be synchronized. This device will be shown because if you had just deleted some maps, a restore can be made of those deleted maps (delete restore cleared upon app exit). Devices with zero differences have faded text. An iCloud connection is needed to sync device map sets.

Selecting a device to synchronize maps with will list map quadrangle names for download and confirmation. If an old device is listed, swipe its entry left to delete it's listing.(Topo Reader\NP Maps: A subscription may be necessary to download maps.) After starting a restore\sync of maps, unwanted downloads can be deleted from the download/install queue in the Maps table, or by pressing and holding for 4 seconds the map quadrangle progress overlay.

Importing Maps & GPX Files

GPX Waypoint, tracks, routes and PDF map files can be imported as email attachments, through iTunes app file share, and as downloads from Safari or other web browser.

To import PDF and JPEG map files using iTunes, select your device Apps tab and copy files into the File Sharing Documents window. Waypoint files must have the .gpx extension while topographic maps must have the .pdf, or be PDF files zip archived with the .zip extension. JPEG files do not contain geospatial data.

PDF files missing geospatial metadata are placed in the Atlantic ocean at coordinate 0°N 0° JPEG images don't embed metadata so will do the same.

(Users of the freemium apps for this purpose should purchase a subscription to stop the banner ads.)

Exporting GPX Waypoints Routes/Tracks

In the Waypoints and Routes + Tracks menus, a upload button will be shown if exporting capabilities are available over email or SMS text messaging. The export file format is GPS exchange (GPX) format, an XML file type.
(A subscription purchase in freemium versions of this app may be required to enable GPX exporting.)

Aligning Imported Maps

Imported JPEG map images, and PDF files missing geospatial metadata, can be aligned to WGS84 datum coordinates by adding four(4) special waypoints. Locate four points on the map image that can be assigned WGS84 coordinates, such as topo map hash marks, or even road or path intersections that can be seen on the satellite map for the coordinate. These four point need to be located in a rectangle or trapezoid formation: 1) Center the crosshairs on a map image point while zoomed in close for best accuracy. 2) In settings menu press and hold for 5 seconds the Add waypoint button. This drops a special "ALIGN POINT: #" waypoint. The "#" count is used to determine these first four points. This # can be changed and can have a decimal fraction. 3) Selected the waypoint coordinate text field and type or paste in the WGS84 latitude and longitude coordinate. 4) Repeat for the remaining alignment points. 5) In the settings Maps menu, find the map in the table, press and hold for 2 seconds to segue to the Edit Map Info window and tap the "Apply Alignment Waypoints" button. Additional alignment points, five or more, can be used to fine tune non-linear maps, such as hand drawn insets. Also, topography maps should have the first four points near or in the map corners and a fifth alignment point placed in the map center to provide best alignment. Adding "Neatline" points allow for cropping out the map margin boarder. Neatline points are optional and requires a minimum of four(4) alignment points. Neatline points must be put in each corner of the map image and along its outline. The placement order must be in a clockwise formation following the ascending # value of the "ALIGN POINT: # NL", 1) Drop an alignment waypoint, press and hold Add button for 5 seconds. 2) Add the keyword 'NL' or 'NEATLINE' to the "ALIGN POINT: #" title, ie. "ALIGN POINT: 2.1 neatline". The NL or NEATLINE can be lower case. 3) In the Maps menu press and hold the map table cell for 2 seconds and tap the "Apply Alignment Waypoints" button in the Edit Map Info window.

Offline Use

This app is designed to display the downloaded topography and National Park Service maps anywhere at anytime without internet data service. However, the Apple Maps reference map layer require internet service to load map image tiles that are not cached and may not be visible when used offline.

The Apple Map tiles covered by topography or park map overlays are not loaded, unless, the Map Opacity setting is below 100%.

Current US Topo vs. HTMC maps

Changing the default download selection between current US Topo or HTMC is done in the "Settings" app, select the "[app name]” menu then set the switch "US Topo Format" to either on or off. The initial default is off since the HTMC format is faster and uses less power. The Historical Topographic Map Collection (HTMC) from the USGS are map archives and do not get updated. These scans have smaller data size and faster rendering. The HTMC maps have a hand crafted appearance. The "US Topo" map sets are regularly updated by the USGS. This format has larger download size and use more power to render. This app doesn't support sublayer controls.

Terms and Conditions of Use


Travel and Navigation:

Always carry paper or hardcopy maps and compass calibrated for your regions of travel. Do not use this app as a resource for navigation. Do not use this app for surveying.

Battery Use:

Pay attention to the device battery reserve. This app does not monitor battery reserve and does not warn of impending loss of power. Terminate this app if it is attempting downloads, network indicator swirl showing, without network access or on battery power by double clicking the home button to access the Task Manager and swipe the image of this app upwards. On restart this app will prompt to 'Forget' or 'Continue' the pending downloads, press 'Forget'. On battery power, minimize use, avoid and stop downloading of unnecessary maps, and sleep the device.


Maps may and will show topography and features that no longer exist, changed location and route including roads, trails, bridges, buildings, elevations, lakes, streams, springs, wells, dates and other features natural and man made. The maps from the USGS Historical Topographic Map Collection are NOT updated and the information shown is dated by years, decades and over a century in age. Of the available collection of maps that can be downloaded, a small number of maps known and unknown may contain flaws in the accuracy and correctness for the imaging and metadata including neatline and coordinates projections and translations causing maps not to appear, display the wrong map, size, scale, coordinates, datum and user location. Maps may not download due to reasons unknown and due to changes in server, network, data indexing, metadata, software and data base updates or failure.


Maps and map data is not backed up. Waypoints, Tracks and Route GPX data is backed up if the user backs up the device to the iCloud or iTunes. The map data size exceeds the Apple app submission requirements and is considered non-user generated and restore-able data. A subscription repurchase may be necessary to restore maps by re-downloading.


URL requests are encrypted SSL connections with the exception of map downloads may copy the data over plain-text HTTP connection. All other URL requests are encrypted SSL connections. The network transactions this app performs are: (1) requests for map data files downloads in compressed and plain-text HTTP and HTTPS formats, (2) plain-text pings to for network availability, (3) geocoding search requests that are transmitted using only secure HTTPS URL transactions, (4) event usage logging if not opt-out on SSL connections, (5) iTune store purchases and receipt logging on SSL connections.

User Data and Privacy:

If event logging is enable, feature usage may be logged and periodically uploaded on an encrypted SSL connection. The data logged may include GPS locations, maps installed, map center coordinate and altitude, search text, vender device UUID, and device name and locale. No data beyond the scope of this app is logged. To opt-out and disable event logging, select this app in the "Settings" app and in options set the 'Event Logging Opt-Out' to on. Event logging is opt-in when the app installed. When event logging opt-out is enabled only subscription menu selection and purchases are logged.

Data Usage:

Downloading maps can induce a significant data usage on network plans. Downloading on WiFi networks with unlimited or high data limits is recommended. Download size can range from 2MB to 60MB with a median of 11MB and average of 13MB per topographic map.


Future releases of this software reserve the right to make change to these terms and conditions.

Continuation of Service:

The company (Delcartes LLC) reservers the right to enact subscription charges to continue up keep and operation of the computer servers and databases. The company makes no promises or guarantees to continue operation of services to deliver data, map downloads, or update data bases from company servers, the National Park Service, Forest Service, or USGS servers.


The authors and copyright holders of this software makes no claims, promises or guarantees about the accuracy, completeness, or adequacy of the contents in the software and map contents and expressly disclaims liability for errors and omissions in the contents and maps.

No Warranties

Limitation of Liability

Delcartes LLC is not affiliated with the USGS, National Park Service, Natural Resources Canada, and other government agencies.

Not all geospatial projections and metadata formats are fully supported. Please email support with geospatial PDF maps that incorrectly install.
* Some iPad models and iPod Touch models do not have GPS hardware for offline location service. Continued use of GPS running in the background can dramatically decrease battery life.


Created by: Dennis E. Lindsey
SSZipArchive: Sam Soffes
MiniZip: Gilles Vollant, Mathias Svensson, Even Rouault, Xavier Roche
Network Clock: Robbie Hanson, Gavin Eadie, Nguyen Cong Huy
Topographical artists and cartographers:
United States Geological Survey,
National Park Service,
US Forest Service,
Natural Resources Canada/Ressources Naturelles Canada,



Updated March 5, 2018. Copyright 2018, Delcartes LLC