+0 WORD Version Code (?)
+2 22 BYTEs unused
+24 500 WORDs Visibility Information. For each planet:
bit 0 unused
bit 1 player 1 saw it
bit 2 player 2 saw it
...Until version 2.2, this file is stored in host byte order, i.e. little-endian on (for example) Intel machines and big-endian on Suns. Since version 2.3, it uses little-endian order, like all other VGAP file formats.
