Code letters

Code letters or ship's call sign (or callsign) were a method of identifying ships before the introduction of modern navigation aids and today also. Later, with the introduction of radio, code letters were also used as radio call signs.

Code letters

Code letters or ship's call sign (or callsign) were a method of identifying ships before the introduction of modern navigation aids and today also. Later, with the introduction of radio, code letters were also used as radio call signs.