Navigation and Seamanship

4.2.4. Some Important terminologies used in signalling

Visual signalling is any method of communication the transmission of which is capable of being seen.

Sound signalling is any method of passing Morse signals by means of siren, whistle, foghorn, bell, or other sound apparatus.

Originator is the authority who orders a signal to be sent.

Identify signal or call sign is the group of letters and figures assigned to each station by its administration.

Station means a ship, air craft, survival craft or any place at which communication can be effected by any means.

Addressee is the authority to whom a signal is addressed.

Group denotes more than one letter or numeral which together composes a signal.

Numerical group consists of one or more numerals.