I wish I was an expert with GPS. I wish I had an App that would allow me to plan a hike to go to several points on the map.
I have tried to use GPS at Fort Pillow, TN to mark locations of earthworks, peaks(& possible Confederate sniper locations) and the modern trails while wandering thru thick woods.
But there is a Problem. There are no cell towers and signals are bad. So I cant even trust my Elevation readings.
But you get the idea of how GPS can be used.
Also you can take the GPS coordinates and input it into Google Maps. One of my friends who researches WW2, created a spreadsheet of GPS coordinates and dates, unit ID, & text which he imports into Google
Earth. (For some reason, I can no longer open Google Earth without downloading a program.)
Here is one such map my friend created. Each point has a date and a Unit ID. If not then it was his father's 752 Tank Battalion and lists the company or tank platoon. Some hills and locations are marked in White with GPS(expressed in decimals) OR the Army 6-digit grid coordinate. No enemy units plotted on this map.