symbol
fm
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1
Abbreviation for "fathoms," a unit used to measure water depth.
"The chart marked the channel at 12 fm."
How to Use Fm
Learner’s notesIn plain EnglishA short way of writing "fathoms" on nautical charts and depth readings.
Common mistake
Don't confuse this abbreviation with FM the radio broadcasting format — context (nautical charts vs radio dials) makes it clear which is meant.
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Fill the Gap
Can you complete this real example?
The chart marked the channel at 12 _____.