51. At 1016 your GPS position is LAT 41°07.6'N, LONG 71°37.9'W. At 1104 your position is LAT 41°00.2'N, LONG 71°29.4'W. What was the true course made good between the two positions?

The true course made good between the two positions is 139T, calculated using plane sailing to determine the departure based on the difference in latitude and longitude and the mean latitude, then applying the tangent function to find the course angle within the southeast quadrant.