[Paddlewise] What is the "boat depth"?

In my folding F-craft Kahuna the 12.5" depth quoted in its specs happened to
be the skin-to-skin height at the aft cockpit rib, i.e. at the back-rest.
(While the maximum depth of 13 3/4" is at the fore cockpit rib).  Is it a
common way to measure depth at the aft cockpit side? How do they measure depth
in a doubles then :-), or in folders with high washboards like Folbots.  Btw,
Bagboaters Yahoo group is sort of closed for now, - I don't see "messages"
section on that page. 


Alex.


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