There are many data sources publicly available. Here are some examples that you can use with the NavOffroad Planner and the NavOffroad iPad® and iPhone® apps.
GIS files provided on this page are licensed under CC BY-NC 4.0. They are a compilation derived from public-domain sources. The underlying source data remain public domain. This license applies only to the compilation, formatting, and curation.
© Stephen Denham, 2023 - 2026
You can import GPX and KML files into NavOffroad Planner by selecting 'File' from the 'Import' menu, and export them as GeoJSON from the 'Export' menu. GeoJSON files can be be imported directly into the NavOffroad iPad® and iPhone® apps. The apps can also import GPX and KML files up to 2MB.
GPX and KML files are widely available online through mapping websites, hiking and off-road communities, and shared trail databases. Keep in mind that the accuracy and quality of these files can vary, so it's best to review them before use.
You can add map tile layers to the NavOffroad Planner. Select 'Map tiles' from the 'Import' menu and enter the 'XYZ' formatted URL, e.g., for the US topographic map:
https://basemap.nationalmap.gov/arcgis/rest/services/USGSTopo/MapServer/tile/{z}/{y}/{x}To use map tiles in the NavOffroad iPad® and iPhone® apps, first select 'TileJSON' from the 'Export' menu (in the NavOffroad Planner). This downloads a TileJSON file that defines your Tile Map Server layer. You can import it directly into apps. You can also import a TileJSON file into the NavOffroad Planner from the 'Import' menu . It must have the extension '.json' or '.tilejson'.
Note: if you import multiple layers, they stack on top of each other.
Here are TileJSON files that you can use:
OpenStreetMap as other tile server examples.
Cloud Optimized GeoTIFF (COG) is a standard for hosting geo image files on the Web. Select the 'Cloud Optimized GeoTIFF' option from the 'Import' menu and enter the COG URL. Follow the steps in the previous section to generate a TileJSON file that you can import it into the NavOffroad iPad® and iPhone® apps. You also import the COG URL directly in the apps.
You can download offroad trails into the NavOffroad Planner by selecting 'Offroad trails' from the 'Import' menu. The trails within the currently displayed map area will be shown. You can repeat this process for different map areas. Once you're ready, you can export the trails and import them into the NavOffroad iPad® and iPhone® apps. The apps can also download offroad trails directly.
Trails are color-coded in increasing level of difficulty:
| Unknown | |
| Easy | |
| Moderate | |
| Challenging | |
| Difficult |
Important: The scale is realtive so one person's easy might be another's moderate. Always check the trail in advance.
Offroad tails are provided by © OpenStreetMap under the Open Database License and are selected based on the following criteria:
Here are land use overalys (updated May 2025) that you can download and use directly with the NavOffroad Planner or the NavOffroad iPad® and iPhone® app. Please ask if you don't see your state and we will add it.
The land color coding is:
| Department of Defense | |
| Bureau of Land Management | |
| National Park Service | |
| Forest Service | |
| Army Corps of Engineers | |
| Fish and Wildlife Service | |
| Bureau of Reclamation | |
| National Resource Conservation Service | |
| Department of Energy | |
| American Indian Lands | |
| Non-Governmental Organization | |
| Other State | |
| State Fish and Wildlife | |
| State Department of Land | |
| State Parks and Recreation | |
| County, Regional Agency Land | |
| City Land | |
| Private | |
| Joint, Other, Unknown |
You can get historical maps from the Topo Map Explorer. Click the map at your desired location and then select one of the maps displayed in the left sidebar. Right click on the download button and the copy the link. See the instructions in Cloud Optimized GeoTIFF section to import the URL.
You can download GeoJSON files to import from the categories on the U.S. Forest Service - Geospatial Data Discovery web page. Use the filters to select your area and the data you need (e.g., name and latitude/longitude). Select the download button and choose the GeoJSON option.
These wilderness area maps are in Google Earth format. Here are equivalents in GeoJSON that you can import directly into the NavOffroad Planner and the NavOffroad iPad® and iPhone® apps.