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USCG Exam PracticeChart symbols and abbreviations (Chart No. 1)

A chart title block states that soundings are in fathoms. A sounding of '3' is plotted in a channel. What is the depth represented by this sounding?

  1. A. 3 feet
  2. B. 3 metres
  3. ✓ 18 feetCorrect
  4. D. 30 feet

Why C is correct

One fathom equals 6 feet. A sounding of 3 fathoms therefore represents 18 feet of water depth, referenced to MLLW. The unit of soundings must always be verified in the chart title block before plotting or passage planning. (Bowditch Ch. 4 §403)

Cited:Bowditch Ch. 4 §403

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A chart title block states that soundings are in fathoms. A soundin… — USCG Exam Practice · CaptainsGround