USCG Exam Practice · Chart symbols and abbreviations (Chart No. 1)
A mariner is planning to anchor and notes the bottom-type code 'R' on the chart near the intended anchorage. What should the mariner conclude about the holding ground?
- ARock bottom, which is generally poor holding ground for a conventional anchor.✓ correct
- BRubble bottom, which provides moderate holding ground.
- CRippled sand, indicating a shifting bottom that may foul the anchor.
- DReef coral, which is good holding ground but environmentally sensitive.
Why A is correct
The chart code R indicates rock. Rock is generally considered poor holding ground because a conventional anchor cannot dig in. The Light List bottom-type codes are used specifically to assess holding ground for anchoring. Light List — Bottom Type Codes.
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