We’ve added a new USGS Geological Map of the contiguous United States made with USGS data, which several researchers who use Gaia GPS have requested. You can add the map source to Gaia GPS through this link, or by tapping on the plus button in the Gaia GPS layers menu. You can also view a legend for the map on the USGS site.
This layer is best when displayed as an overlay on top of other base maps (topos and aerials) using GaiaPro, but can also be displayed by itself for reference.
Send us a note at firstname.lastname@example.org if you have any other map sources you’d like us to add.