Figuring GRT for a Hunter 31.

J

JImbosails

.
Feb 17, 2025
3
Hunter 31 Smithville Lake
I have a Hunter 31 and I am trying to calculate the GRT. Some sites say to use the depth of keel and others say to measure from the gunnel to keel and one says to measure from top of cabin to keel.
GRT=(0.375 X L X B X D)/100 L and B are straightforward, has anyone determined the GRT for a Hunter 31.

Thank you
 
jssailem

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
22,439
CAL 35 Cruiser #21 moored EVERETT WA
Do you have the original documents of your boat?
GRT is found on a vessel’s certificate of documentation (COD), a certificate of inspection (COI), or in some cases a “tonnage certificate".​
 
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D

dlochner

.
Jan 11, 2014
12,471
Sabre 362 113 Fair Haven, NY
The height from keel to gunwale depends on whether the keel is encapsulated or bolted on

Encapsulated hulls are measured from the bottom of the keel. Bolt on keels measure form the bottom on the hull which the place the keel attaches.

If you are looking to document the boat there is a measurement form on the USCG documentation center website.
 
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