Explanation:

A ship's crew comes from a number of different countries. Not everyone has English as first language or can communicate very clearly in English.
Misunderstood communication can lead to serious and even dangerous situations. To avoid such confusion, in 1983 a new system of communication called Seaspeak was devised.
English was chosen as the principle lexicon for Seaspeak because it was the most common language spoken on ships at that time, and, importantly, it was also the language of civil aviation.
In 1988, the International Maritime Organization made Seaspeak the official language of the seas.
Seaspeak defines the rules of how to talk on a ship's radio. The number of words is limited to ensure that messages and conversations are short and clear.
Eight words, called message markers, precede each sentence. These words are Advice, Answer, Information, Instruction, Intention, Question, Request, and Warning.
An important rule of Seaspeak is that numbers made up of two or more digits are spoken in single digits. For example, the number 33 is spoken as "three three" and the time 9:33 a.m. is spoken as "zero nine three three."