You are conducting trials to determine the maneuvering characteristics of your vessel. While making a turn, you take ranges and bearings of an isolated light with the results as shown. Based on this information, what is the advance for a turn of 90°? D034DG

Correct Answer: Option B — 870 yards

Turning circle trials utilize radar ranges and bearings to plot the vessel's path. Advance is measured along the original course line from the point of rudder execution to the point where the vessel has changed heading by the specified amount. For this vessel, 870 yards is the recorded advance for 90°.