68. At 0726 you depart Lake Montauk with light 1 close aboard and set course 065° per standard magnetic compass at 6.7 knots. At 0912 your GPS position is LAT 41°10.5'N, LONG 71°46.6'W. What is the current?

The current is determined by comparing the dead reckoning position, calculated from course and speed, to the actual GPS position. This comparison reveals a displacement of approximately 2.5 nautical miles at a bearing of 240 true, resulting in a current of 1.4 knots.