USCG USCG GENNAV
Set 4 • Question #110 of 246
Launch Interactive Practice Room When using a recording depth finder in the open ocean, what phenomena is most likely to produce a continuous trace that may not be from the actual ocean bottom?
A
Echoes from a deep scattering layer
✓ Correct Answer
B
Echoes from schools of fish
C
Multiple returns reflected from the bottom to the surface and to the bottom again
D
Poor placement of the transducer on the hull
USCG NMC Regulatory Explanation
In USCG General Navigation principles (Bowditch, Light Lists, and Coast Pilots), regarding 'When using a recording depth finder in the open ocean, what phenomena is most likely to produce a continuous trace that may not be from the actual ocean bottom', the verified fact is: 'Echoes from a deep scattering layer'.
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