Which combination is used to compute wheelover movement?

• A. Turn rate and drift
• B. Distance to next charted line
• C. Speed, rudder angle, and turn angle
• D. Navaid bearing and range

Answer: (C)

Wheelover movement is about the path a vessel follows when you command a turn, so you need inputs that describe how fast you’re going, how sharply you’ll turn, and how much turning you intend to do. Speed sets the distance traveled per unit time, the rudder angle determines the rate at which the ship begins and completes the turn, and the turn angle tells you how far heading must change. Combined, these allow you to figure the turning radius and the arc length of the maneuver, i.e., how far the vessel moves while the wheel is over. The other factors you might see—drift from wind or current, or navigational references like bearing and range to a nav aid or distance to a charted line—don’t provide the necessary geometric inputs to compute the wheelover arc, so they aren’t sufficient for this calculation.