Code letters

The barque Pisagua. Her code letters RJPT are flown on the jigger mast, above her ensign

Code letters or ship's call sign (or callsign)[1][2] were a method of identifying ships before the introduction of modern navigation aids. Later, with the introduction of radio, code letters were also used as radio call signs.

  1. ^ SHIPSPOTTING.COM >> Mtide Taurus - IMO 7626853
  2. ^ Call Sign is correct and this abbreviation is mentioned usually in all ship's documents now.