I have never used GPS in Glamis (yet) and can almost get most places. 60% of the time, I reach my chosen destination 100% of the time, eventually.
I just need more trips. Cutting across the dunes I'm good to get where I need to be, once I hit Gecko or Wash Road, I may go find a Wash sign or Pad sign to see whether I got left or right LOL.
Of the current popular man-made destination spots I've seen Vets Flagpole, Scapula Satellite - that's it 
Never been to...
Swing Set
Yarnell Firefighters Memorial
Windmill Point
Carmens Bench
These are all gone right?
Carmen’s Landing (Tiki Hut)
RIP
the Xylophones
Water fountain
Marty Plane Crash
Disco Ball
Teeter-Tooter