If a chart indicates the depth of water to be 6 fathoms and your draft is 6.0 feet, what is the depth of the water under your keel? (Assume the actual depth and charted depth to be the same)
ā¢ Relationship between fathoms and feet ā¢ How to compute under keel clearance (UKC): total depth minus vessel draft ā¢ Careful unit conversion before doing any subtraction
ā¢ First, convert the charted depth from fathoms into feet. How many feet are in one fathom? ā¢ Once both depth and draft are in the same units, what simple subtraction do you perform to get under keel clearance? ā¢ After you subtract, which answer choice is closest to your calculated value?
ā¢ Make sure you use 1 fathom = 6 feet when converting ā¢ Confirm that both depth and draft are in feet before subtracting ā¢ Re-check your subtraction: Depth in feet ā Draft in feet = Under keel clearance in feet
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