It's being reported that on the back of the Collector's Edition city map of Grand Theft Auto V there is cryptic information about the game that can only be seen with the use of ultraviolet light. Seems that at the moment, no one has figure out exactly what they mean.
If you don't have an ultraviolet light (Black Light) here is the hidden message that you would see if you turn the map over and light it up with one;
Lago Zan Cudo. Great ocean, highway north, through north chumash, 0.5 miles past Raton Canyon. when guard rail ends, follow the dirt road down the docks. Bring $500.000 cash. xxxxx.