SET AND DRIFT DETERMINATION

1) Plot DR using Speed, Distance, Time from last Fix. See Speed/Distance/Time page label with half circle, Time, and "DR" label course line with Course (True bearing) over Speed (use C and S)

2) Plot FIX using bearings or electronics label with full circle, Time, and "FIX"

3) Plot line from "DR" to "FIX"; the direction is the SET of the current. label the True direction of the Set above the line with "SET="

4) Calculate Speed/Distance/Time for Speed, or DRIFT, on the DR/FIX line. Time = time difference from last fix to DR (2hrs) Distance = measured, with dividers on longitude, from DR to new FIX (4.2 miles) Speed = speed of current in knots per hour, or DRIFT Speed(drift) = 4.2/2=2.1 label below DR/FIX line with "DRIFT="