I’ve used this app on my phone for hiking for years but it has been very helpful in identifying my exact GPS location relative to National Parks, National Monuments, Wilderness Areas, Wildlife Study Areas and more which are not well identified with drone apps showing NFZ. I have not had the occasion to need it for defending my flying location but it would be excellent for that since it has the detail and your pinpoint GPS location. I just used it for a trip in Colorado where I was flying around often complex National Forest and in-bedded Wilderness Areas.