I bought MilGPS a few years ago, when I was still in the Army, back then I paid $10. I used it as secondary/backup/check-location-accuracy. Since it was on my phone, it couldn’t be my primary source. My primary source was a wrist Garmin GPS, I would (discreetly) open MilGPS and check my position, both, my Garmin GPS and MilGPS were always on point, may be 1-2 meters off but that’s nothing since we used a 10 meter margin of error. I’ve always loved the satellite image because it allowed us to plan better when picking routes of travel.
For a one time payment, the accuracy it has and all the things you can do, $10 is a steal.
Highly recommend MilGPS, I have and keep doing it when the subject comes up.