Question 930Navigation General

70% to pass

While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 2 1/2 seconds after the signal was sounded. What is the distance to the shore?

A 225 yards
B 460 yards
C 750 yards
D 910 yards
AI Explanation

The correct answer is B) 460 yards. The reason for this is that the distance to the shore can be calculated using the speed of sound, which is approximately 1,100 feet per second (or 335 meters per second). Since the echo was heard 2.5 seconds after the signal was sounded, the distance to the shore can be calculated by multiplying the speed of sound by the time it took for the sound to travel to the shore and back (2.5 seconds). This gives a distance of 460 yards (or 420 meters). The other answer choices are incorrect because they do not accurately reflect the distance based on the given information. For example, answer A (225 yards) is too short, while answers C (750 yards) and D (910 yards) are too long.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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