Help me out glamis guys that use a gps!

[FireMedic686R]

I am going to glamis and I got a gps so I got these coordinates from dune guide

Cahuilla Ranger Station 32° 58.44 N / 115° 10.30 W
Glamis Beach Store 32° 59.76 N / 115° 04.37W
Wash 10 (shortcut to Boardmanville) 32° 58.81 N / 115° 02.77 W
Boardmanville 32° 59.14 N / 115° 02.06 W
Competition Hill 32° 59.04 N / 115° 07.66 W
Oldsmobile Hill 32° 57.77 N / 115° 05.96 W
The Wall 32° 53.25 N / 115° 01.47 W
China Wall 32° 54.48 N / 115° 02.19 W
Brawley Slide 32° 56.65 N / 115° 04.82 W
Patton Valley 32° 46.50 N / 114° 56.53 W
Test Hill (Freeway Hill) 32° 44.17 N / 114° 53.51 W
Midway Well 32° 42.95 N / 114° 54.89 W
Plank Road Monument 32° 42.72 N / 115° 08.14 W
Plank Highway 32° 42.51 N / 114° 55.35 W
Buttercup Competition Hill 32° 43.82 N / 114° 52.86 W
Ogilby Tower 32° 48.68 N / 114° 53.23 W
Pair-A-Dice 32° 42.62 N / 114° 57.62 W

I was messing around on google earth and google earth has a pin on olds hill.. Well the gps coordinates that google listed were kind of way off the coordinates that I got from dune guide. I just want to see who is wrong so I dont get lost when I get there. Help a brotha out! Thanks