USCG USCG GENNAV
Set 4 • Question #105 of 246
Launch Interactive Practice Room When using an echo sounder in deep water, it is NOT unusual to __________.
A
receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night
✓ Correct Answer
B
receive a first return near the surface during the day, and a strong return at about 200 fathoms (366 meters) at night
C
receive false echoes at a constant depth day and night
D
have to recalibrate every couple of days due to inaccurate readings
USCG NMC Regulatory Explanation
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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