https://www.gaiagps.com/
Gaia GPS is a hiking, backcountry-navigation, and outdoor-mapping app for iOS, Android, and the web. It lets users view topographic, satellite, road, weather, wildfire, public-land, and other specialized maps; record trips; create waypoints and routes; and follow their location using GPS. The free version supports basic navigation and tracking, while Premium adds a much larger map catalog, layered maps, and offline downloads.
For a Gaia GPS Premium membership:
Pros
Download maps—including layered maps—for offline use when you lack cell service.
Access more than 250 maps and overlays, including specialized topographic, land-ownership, hunting, and international maps.
Combine maps with overlays such as contours, hill shading, slope angle, and public/private land boundaries.
Print maps from the Gaia GPS website.
gaiagps.com
Cons
It requires a recurring subscription rather than a one-time purchase.
The most useful backcountry features depend on downloading maps before leaving service.
The breadth of map choices can make map selection and organization feel complicated.
Premium is unnecessary for users who only need basic GPS tracking, waypoints, and Gaia’s standard topographic map.
Gaia GPS
Re: Gaia GPS
In MY humble opinion, Gaia falls a little short on what it could do but it still uses the google earth engine and is a useful tool.