You have determined the maneuvering characteristics of your vessel by taking the radar ranges and bearings of an isolated light while making a turn. The results are listed in illustration D035DG. Based on this data what is the advance for a turn of 30°? Illustration D035DG

Correct Answer: Option C — 470 yards

Advance is measured along the original course line from the initial rudder execution point to the position where the vessel's heading has altered by 30 degrees. Using standardized radar range and bearing plots during turning trials determines this specific perpendicular distance as 470 yards.