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As a vessel examiner for the new vessel safety check program of USPS and Coast Guard, I read this from the manual, it states " A documented vessel must have the name and hailing port plainly marked on the exterior part of the hull in clearly legible letters not less than 4 inches in height. In addition, the documented vessel must have the official Number permanently affixed in block type, arabic numerals not less than 3 inches on some clearly visible structural part of the boat."I made a block of wood and used a router to make the block numbers and affixed it to the hull in an accessable area under the setee. Permanately attached does not mean a bulkhead or other removeable or replaceable part of the boat, if done in that manner a thief needs only do a replacement part, and has your boat for the price of a little bit of teak! The idea of documentation is for theft protection.