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Photo 1 is a typical etched hull number starboard aft top of the topside by ‘Jeanneau’ - (this type is very easy to accidentally or intentionally polish out). Photo 2 a fixed plate type, by Nimbus, clearly showing the vessel as built in 2017.


The ISO also states that: “A duplicate CIN shall be affixed to a non-removable part of the craft in a hidden location only known by the manufacturer. The duplicate CIN shall be located in the interior or beneath a fitting or item of hardware. Catamarans shall have this hidden CIN in or on both hulls. The CIN should be located so that it is extremely difficult to reach and modify”.


From experience different manufacturers have different locations, so if the surveyor doesn’t know from previous experience, he/she can always request clarity from the manufacturer.


Aside from Hull Identification Numbers there is also a requirement for vessels built after June 16th 1998 to also have a permanently affixed Builder’s Plate (CE plate). Extracted from ISO 14945: “The builder’s plate shall be readily visible, preferably in the cockpit or near the main steering position. In any case, the builder’s plate shall be separate from the hull identification number”.


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There are certain minimum requirements, but manufacturers are allowed to include additional information if they wish, as you be seen from the above photographs. Be aware of the maximum loading and, if shown, the maximum power, both of which can sometimes be exceeded.


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In addition to the Hull Identification Number, the Builders’ Certificates can also show the original engine and gearbox numbers which can also give the surveyor good information to determine whether engines and/or gear boxes have been replaced.


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