Ship identification number refers to the unique code used to permanently identify the ship. The Maritime Safety Administration of the People's Republic of China is the competent authority of the ship identification number, responsible for the issuance and unified management of the ship identification number. Each ship can only apply for and use one ship identification number, which cannot be changed once it is obtained.
The permanent mark of the ship number on the ship is from the Song Dynasty. For ships with a length of more than 20m, the character height of the ship identification number is10cm, and for ships with a length of less than 20m, the character height is 5cm.
The ship identification number consists of English letters CN and 1 1 Arabic numerals. CN stands for China, the first four digits of Arabic numeral 1 1 indicate the year when the keel of the ship was laid, the 5th to 10 digits are random numbers, and1digits are check codes.
Ship call sign, abbreviated as call sign, is the only identification signal assigned to each ship by IMO. The call sign is mainly used when ships contact at sea, dock and report information, just like the special ID card for ships. Because the use of digital signals or ship names may lead to misunderstanding in identification, a special call sign is adopted, and the pronunciation of the call sign is also special and special, which is easy to identify. For example, a: read in the call sign:
Alpha 26 letters and 10 numbers have a special call sign.