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Glossary term Description
gallon

Measure of volume with several forms. 1 US gallon = 3.785 litres. 1 Imperial gallon = 4.546 litres. Occasional industry standard measure, rather that litres (metric)

gas carrier Specialised vessel for the carriage of LPG or LNG.
general cargo Goods packaged or unpackaged but not in bulk.
GMT

Greenwich Mean Time 

GPS

Global Positioning System, position fixing system using signals from satellites

grating

Floor of a refrigerated hold/container, designed so air can flow along the floor 

graving dock

Drydock for vessel maintenance

growlers

Icebergs.  Blocks of ice that have broken free from the parent shelf and may be a navigation hazard

grt

Gross registered tonnage. The moulded volume of all enclosed spaces of the vessel. A formula is then applied to those measurements, hence no unit of measurement is assigned and the figure is simply referred to as the vessel’s gross tonnage

gt

Gross tonnage. A function of the moulded volume of all enclosed spaces of the ship as per the 1969 International Convention on

Tonnage Measurement of Ships