0 0 RESERVED
1 1 GENERALLY IN THE DIRECTION NE
2 2 GENERALLY IN THE DIRECTION E
3 3 GENERALLY IN THE DIRECTION SE
4 4 GENERALLY IN THE DIRECTION S
5 5 GENERALLY IN THE DIRECTION SW
6 6 GENERALLY IN THE DIRECTION W
7 7 GENERALLY IN THE DIRECTION NW
8 8 GENERALLY IN THE DIRECTION N
9 9 SPECIFIC DIRECTION INDETERMINABLE
15 15 MISSING VALUE
