National (federal) datasets
Federal GIS services that cover the U.S. (including Alaska). Many are already documented under Alaska where they’re used in the TrueTopo app.
Agencies
- BLM — Land status, mining claims, RS2477, 17(b)
- USGS — MRDS, ARDF, NHD, 3DEP, geology, faults
- NOAA — Weather, marine, coastal (as we add them)