
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="
