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Deck: Retired questions · Safety

Question 2,207 of 107

Retired question: the Coast Guard no longer draws it on exams. Practice the current Safety module instead.

In order to calculate the TPI of a vessel, for any given draft, it is necessary to divide the area of the waterplane by __________.

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Mariner discussion

Comments from mariners who studied this question.

Sh Shawn · Sep 3, 2015

TPI: Tons Per Inch Immersion
AWP: Area of Water Plane
420: Is the number that is equal to 12" * 35 FT^3/Ton of salt water.

TPI = AWP / 420