XBIT

Every tile on the map has a 1 byte (FF) XBIT value for it, setting various flags about the tile.

Flag Information for Each Bit Position

Bit Position	Decimal	Flag Meaning
0	+1	Salt Water (Will water on this tile be fresh or salt water)
1	+2	Flip the tile (from the perspective of the sprite it is horizontally mirrored)
2	+4	Surface Water (Is this tile covered in water)
3	+8	Mark bit (When this bit is set, it seems to be involved in quite a few calculations, some could well be to do with land value)
4	+16	Watered (Is this tile receiving water).
5	+32	Piped (Can this tile receive water).
6	+64	Powered (Is this tile receiving power).
7	+128	Powerable (Can this tile receive or need power).