Zitat
The game keeps a counter that increases each time you take a step. Each step a random number is picked from 0 to 255, if this number is less than (counter / 256 ) then a fight occurs. When a random encounter occurs the counter is reset to 0. If the lead party member has a Charm Bangle equipped, then the number added is cut in half. If mog has the Moogle Charm equipped, then the counter is not increased and there is no chance of random encounters.
Values added to counter by terrain:
Terrain Value
Caves 112
Grass 96
Desert 192
Forest 192
Snow 112
Town 112
Mountain 112
...