10 0 RESERVED
21 1 ADCP (ACOUSTIC DOPPLER CURRENT PROFILER)
32 2 GEK (GEOMAGNETIC ELECTROKINETOGRAPH)
43 3 SHIP'S SET AND DRIFT DETERMINED BY FIXES 3-6 HOURS APART
54 4 SHIP'S SET AND DRIFT DETERMINED BY FIXES MORE THAN 6 HOURS BUT LESS THAN 12 HOURS APART
65 5 DRIFT OF BUOY
76 6 ADCP (ACOUSTIC DOPPLER CURRENT PROFILER)
87 7 MISSING VALUE
9