yeh, that place where the yellow upwards blip always seems to be pointing, me and a friend figured out a glitch to get up. it didnt involve and cheats/trainers/mods/editing files and i can swear on that. anyway heres some screens:
it doesnt show a health bar or radar, and when i found a weapon it didnt show the ammo but other players could kill me and i could kill them. the only problem was i couldnt get in a car because the game thought i was still on the character select screen and if i pressed return or f, it would select the career and i would spawn. heh it was fun thought.