Those formulas are great but they are not at all helpful if his tank as inaccessible as mine in my 2000 23 ft sea craft. You might get one or two of the measurements, but not all three. Just my two cents.
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Steve
1978 20 ft. Master Angler (175 merc)
2000 23 ft. Seacraft (225 opti)
1984 17ft. Boston Whaler (90 merc)
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