A service tag is an 84-bit description of a given map. The lower 53 bits are the map seed. The upper 31 bits describe the parameters given to the map generator. They are: BLLC.CCNA.MPPR.RRII.WWYY.YYYY.HHED.D##S [The rest is for the 53-bit seed] B: Minimize large continents being split at international date line L: Land percent C: Climate N: New world (0: Start anywhere reasonable; 1: new world or same landmass) A: Allow Pangeas M: Eliminate coastal mountains and reduce other mountains P: Patience R: Map ratio I: Island factor W: Map wrap Y: Vertical map size H: Player handicap (bonus resources) E: Everyone on same landmass (0: No 1: Yes [New world also has to be set]) D: Map Resource distribution #: 2-bit "parity" of all other digits in service tag; error check S: Map seed