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Old 02-26-2010, 02:27 PM   #1
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Default Vessel Gross Tons.....

Can anyone let me know what the Gross tonage is of my boat? It's 36 foot long with the engines...give or take a foot.

Thanks in advance!
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Old 02-26-2010, 02:37 PM   #2
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its measured as the volume of space below deck. there is a formula to calculate it
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Old 02-26-2010, 02:51 PM   #3
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Try this:

http://en.wikipedia.org/wiki/Tonnage


Ken
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Old 02-26-2010, 02:56 PM   #4
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kchace actually answered your question per the way it was asked.

But were you really just asking how much your boat weighs? Just a thought...
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Old 02-26-2010, 03:16 PM   #5
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No, I'm asking the correct tonnage... Filling out Capt. license app and its one of the questions...

Thought someone would just know off the top of their head....
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Old 02-26-2010, 04:01 PM   #6
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Here is a link to an easy to use form, fill out, hit enter and tonnage will be in upper RH corner.
beans...
http://www.uscg.mil/hq/msc/docs/CG-5...6-04_v1_0b.pdf
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Old 02-26-2010, 04:17 PM   #7
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gross tons= the total area of the interior volume of a vessel (all spaces)
net tons =the total area of all cargo spaces (in a pleasure boat that means all interior spaces that could carry cargo) it is based on the old usage of a measurement to indicate a vessel's earning space.

Gross Tonnage has historically been used by the government to determine manning requirements, safety requirements etc.

neither are related to weight and are both expressed in units of area despite the "tonnage" part of their name
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Old 02-26-2010, 07:16 PM   #8
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I wanted to say simple, it's the vessels weight wait, what weight wet or dry does that include the weight of the passengers that it's certified to carry? Some say it's it's hull volume, hummmm that's the weight too. Now a well informed poster tells us the real meaning that probably is the real meaning which does not help you much, as now it can't be answered.But hey, lets just make it simple but what you think the thing weights don't worry about loads cargo people, heck just put 32,000 lbs or what's that, 16 tons. wait should that be tonnes . hummmm I don't know what that means, lets just use 16 tons and if you are wrong, then you could bring up all these points and then they'll probably say "sounds about right"
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Old 02-26-2010, 08:26 PM   #9
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Gross tonnage is the displacement of the hull. The formula is based on Archimedes theory. Its a measurment of the length, width and actual underwater shape of the hull.
Its usually expressed in tons such as a 200 ton displacement tug or a 78000 ton displacement aircraft carrier. Thats how commercial boats and ships are measured. Never heard of measuring the inside space of a vessel to get the tonnage but I imagine someone came up with a method that uses it.
Don't know the exact formula but you can look it up.
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Old 02-27-2010, 06:26 AM   #10
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The above note with the link to the Simple Form is correct. Pay close attention to the instructions as well. I keep all of these documents (and other license documents) here:

http://www.commercialcaptains.com/additional_resources

You may find some of the other links helpful if you have served aboard other vessels as well.
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