A. receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night 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 « Previous Next »
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