well as far as i know about this is:
each time u spawn u spawn in a 6x6 area... a second i found this in a chinese site, and traduced it.. maybe red returns to city means something:
(11) red returns to the city revision method [ east rising sun Shanghai ]
33 B8 0D 000,000 E8 6,429 red reactivating map
47.03 million 8B 55 EC 8,942 X actual grid reference reduces 6
9C 020,000 8B 55 EC 8,942 Y actual grid reference reduces 6
33 million FF FF FF FF 04 red returns to the city volume to return to a city map
4D 030,000 E8 88 BE F4 FF 8B X actual grid reference
A2 020,000 E8 99 BE F4 FF 8B Y actual grid reference
After 33 8B 45 FC C7 80 8C 0,000 users red names information storage record place map
4D 030,000 8B 45 FC C7 80 X actual grid reference
A2 02.000033 million C0 5A 5,959 Y actual grid reference
3.300000055 billion 8B EC 83 red villages safe area gridded maps
4D 0.300009933 billion C2 2B X actual grid reference
A2 0.200009933 billion C2 2B Y actual grid reference