A Local User Terminal in the Cospas– Sarsat system for receiving signals from geostationary satellites fitted with Cospas–Sarsat packages. See also LUT.
A satellite whose period of revolution is equal to the period of rotation of the earth and whose circular and direct orbit lies in the plane of the Earth’s equator; that is, a satellite which remains in the same relative position to any point on Earth. Approximate altitude of satellite is 36 000 km above earth’s surface.
Gigahertz (1 000 000 000 hertz). A measurement unit of radio frequency, oscillation and vibration equaling 1 000 000 000 cycles per second.
Global Maritime Distress and Safety System.
Greenwich Mean Time (see also UTC).
Global Navigation Satellite System (eg. GPS,Glonass, Galileo).
General Operator’s Certificate of Proficiency
Global Positioning System. A satellite
Gross Tonnage (replaces Gross Registered Tonnage (GRT))