General Operator’s Certificate of Proficiency
Global Positioning System. A satellite
Gross Tonnage (replaces Gross Registered Tonnage (GRT))
Radiotelephony using amplitude modulation, single sideband, full carrier
High Frequency (3 to 30 MHz)
Locating signals transmitted by a ship in distress or survival craft to provide a bearing for searching vessels and aircraft.
International Civil Aviation Organisation.
International Maritime Dangerous Goods Code.