czachary,
NO, you won't find trail markers, symbols, or anything REAL on GE, unless you have already seen them up close and know where to look on GE.
GE will only give you a million shadows and overlay mirages. There are a ton of trail markers in Anza Borrego Desert. Remember, Capt Juan Antonio De Anza's Trail from Nogales to Monterrey goes along the Eastern edge of the Coyote and Fish Creek Mountains. They camped at the San Sebastian Marsh (confluence of San Felipe Creek and Carrizo Wash). They then traveled around the North side of Borrego Mountain following San Felipe Creek, up through Borrego Springs, through Coyote Canyon, and over the hill towards the ocean.
Spend some time following that trail and you will find a bunch of trail markers, water source monuments, and such. There are no shortcuts (I.E. GE). Just get out there and use your eyes. Take some pictures, and post them. If you have some of the real markers, I will let you know it. There's probably not a 100 foot patch of ground in Anza Borrego that I haven't put a foot in.
I don't give too much assistance to armchair explorers, but if you spend time out there, I don't mind helping out.
Best - Mike