You may search for a vessel by entering its Vessel Number. Vessel Numbers are 6 to 8 characters long and may contain all digits (1-9) or begin with 1 or 2 letters (A-Z) followed by 6 or 7 digits. The wildcard search option (%) is available in the Vessel Number field. The Vessel Number search consists of the “Official Number” (Coast Guard assigned number for documented vessels), Coast Guard assigned number for undocumented vessels, or the IMO number.