A fair explanation, but your first several posts on the topic indicated you did not
understand the measurement. It was only after I posted the link to the measurement that
you started to get it close to right.

Modern measurement of tonnage does not generally measure to the coachroof, it only goes up
to the deck. Thus, a vessel with full headroom might only be listed at 5 feet. My old
Nonsuch, with generous headroom ( 6.5 feet ?) is listed as having a 5.6 foot Depth.



"Simple Simon" wrote in message
...
You are misinformed. Documentation looks at tonnage
and tonnage is a measure of volume and has little
to do with displacement.

Allow me to quote an authority - Eric Hiscock from his
fine book, "Cruising Under Sail".

"Depth is an internal measurement taken from the underside
of the deck amidships to the top of the main keel."

"Tonnage is found by calculating the capacity of the hull
and then making certain deductions for engine space,
stores, chartroom, etc."

In other words, tonnage, when documenting a vessel, is
a figure that represents internal volume and ability
to haul cargo therein. This type of tonnage actually
is derived from the word 'tun', which is a cask used in the
wine trade and the size of a ship used to be judged by the
number of tuns that could be stowed in the holds.

I'm surprised an old salt like you is so ignorant when
it comes to documented tonnage.

S.Simon


"Thom Stewart" wrote in message
...
Simple,

Once again I'm sorry to say, you are wrong.

The depth has to do with the height of the HULL. When you spoke of
tonnage, you were referring to displacement. Displacement refers to the
weight of the water displaced by the HULL. The Hull is measured from the
Gunnel to the top of the keel. The tonnage has to do with displaced
water not cargo space.

It is not measured to the cabin overhead, any more than it is measure to
the height of the cockpit floor. The 5 ft Measurement is probably
correct. Superstructure doesn't count.

The measurements on the application is just another example of Coast
Guard "Gobble-de-Gook" The CG acts like it is their duty to make
anything simple a subject to a complicated interruption.

AND: "I'LL DRINK TO THAT!"

Ole Thom