Question 860Navigation General70% to pass
The apparent wind's speed can be zero, but only when two conditions are present. One condition is that the true _______________.
AI Explanation
The correct answer is D) the wind's speed equals the ship's speed.
The apparent wind is the wind that is felt on the ship, which is a combination of the true wind (the actual wind blowing) and the wind generated by the ship's motion. When the ship's speed equals the true wind's speed, and the true wind is from dead ahead, the apparent wind's speed will be zero. This is because the wind generated by the ship's motion exactly cancels out the true wind, resulting in no net apparent wind.
The other options are incorrect because: A) the true wind's direction does not need to be on the beam; B) the true wind's speed does not need to be zero; and C) the true wind does not need to be from dead ahead, as long as the ship's speed equals the true wind's speed.
Related Questions
#858 Automatic identification systems (AIS) are required to do which of the following? #859 Which of the following statements is TRUE regarding automatic identification systems (AIS)? #861 If an observer in the Northern Hemisphere faces the surface wind, the center of low pressure is to his _______________.#862 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. Your position is LAT 64°42'N, LONG 02°28'W. How would this be encoded? #863 Your vessel is participating in the Voluntary Observing Ship Program, at 1800 ZT on 31 October your position is LAT 24°50'N, LONG 92°37'W. You are preparing WS Form B-80 as seen in illustration D041NG below. How should you encode the first three groups after the call sign if you estimate the wind?