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