When using an echo sounder in deep water, it is NOT unusual to __________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night
In USCG General Navigation principles (Bowditch, Light Lists, and Coast Pilots), regarding 'When using an echo sounder in deep water, it is NOT unusual to', the verified fact is: 'receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night'.
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