I'm working through BoatUS to document my R-23 with the Coast Guard, and the minimum size is 5 tons of "tonnage".

To calculate the tonnage via the formula, they need the length (at waterline), breadth, and depth (not draft).

I assume the length is 23ft, and the breadth is 8.5ft, but what is the depth of the R-23? Apparently it's from where the cabin attaches to the hull down to the keel.

I'm the second owner, so I don't have the original builder's certificate from the factory, though I'm not sure that would have the tonnage info included?

Also, if anyone knows of other R-23's that are already documented that would probably help too

Thanks!