Special item purpose

Value	Name
0	Compass (see orientation)
1	Monster eye (see nearby enemies)
2	Magic picture (see day and night)
3	Wind chain (able to use wind gates)
4	Map locator (see map coordinates)
5	Clock (see time)

Special item purpose bits

Those are used in the savegame to specify if those are active.

Value	Name
0x01	Compass (see orientation)
0x02	Monster eye (see nearby enemies)
0x04	Magic picture (see day and night)
0x08	Wind chain (able to use wind gates)
0x10	Map locator (see map coordinates)
0x20	Clock (see time)