USCG Exam Practice · Chart symbols and abbreviations (Chart No. 1)
On a US nautical chart, the letter code 'M' annotated near an anchorage symbol indicates what bottom characteristic?
- AMud✓ correct
- BMarl
- CMixed
- DManganese nodules
Why A is correct
Chart bottom-type codes include M for mud, S for sand, R for rock, and others. Mud is generally considered good holding ground for anchoring. Light List — Bottom Type Codes.
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