http://imageshack.us/photo/my-images/69/bigempty2.jpg/

Red:
3 on various Hexcrete blocks north of X-7a "Left Field" Artillery Launch and X-66 Hexcrete Archipelago
Door to Z-43 Innovative Toxins Plant
Side of filing cabinet in canyon NW of Signal Hills Transmitter
Door to Z-14 (Cazador lab)
Door to Securitron De-Construction Plant
Door to Y-17 Medical Facility
Door to Z-9 (nightstalker lab)
Wall in Boom Town
Wall of Hazmat Building
Door of X-2 Transmitter Array
Crate in canyon SW of North train tunnel

White:
Locker on a trail leading into Big MT, NW of Little Yangtze
Crate just south of first one, on the ridge west of LY
Locker on a trail out of Big Mt south of X-7a "Left Field" Artillery
Side of a train car south of the North Train Tunnel
Side of a train car next to Mysterious Cave
Entrance door to North Tunnel

Blue:
Front and rear doors to Z-38 Lightwave Dynamics Research
Door to control room of X-7a "Left Field" Artillery
Door to Saturnite Alloy Research Facility
Locker outside The Cuckoo's Nest
Door to Signal Hills Transmitter
Door to X-17 Meteorological Station
Floor of control room in X-17 (next to map of the Divide)
Inside the control booth of Waste Disintegration Platform
Locker outside Ulysses' Point

White seem to be trail markers.
Blue are caches/ rest/ supply locations? (Cuckoo's nest is the odd one out)
Red are danger locations? Doors = hostile mobs inside, walls = radiation/ patrols? (2 in the canyons seem odd ones out though)

I have no idea what the code is, plus I'm not even sure if Obisidian intentionally left a pattern

well there is a cache in the outside of the nest, not to mention the graves near it full of loot XD. Also dont be afraid to look for Ulysses duffle bags in high places cause there are plenty.

Except the part where Chris deliberately wrote the dialog lines that the actor reads above? :whistling:

-Gunny out.

amurica?

If I remember, one color always had healing items at it, I think it was white? The OP has provided a nice list of locations, but what was found at each location? Story elements, like terminal messages, holotapes, environmental cues? Stashes of loot, ammo, chems, etc..? Particularly hard enemies, difficult quest points or traps? Anyone want to do a little research?

-gunny

The colors he left as a trail, was on the way to the crater. Not IN the crater. I'm thinking the trail he talks about is in the Divide. The courier will enter the Divide and backtrack the colors to locate him.

Been playing some Minecraft I can see.

Thanks for the map OP Been tryina figure this out since I heard the holotape.