0 0 No report
1 1 Previous position
2 2 Present position
3 3 30 nautical miles
4 4 60 nautical miles
5 5 90 nautical miles
6 6 120 nautical miles
7 7 150 nautical miles
8 8 180 nautical miles
9 9 More than 180 nautical miles
15 15 Missing value
