Galvanic series

A ranking of metals by their tendency to corrode in a given electrolyte (typically seawater); used to choose compatible fasteners, fittings, and sacrificial anodes.

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Related G-terms

GRIB file

A compact binary weather-data format (Gridded Binary) used to download forecast wind, pres…

Grab bag

A watertight bag pre-packed with survival essentials (flares, water, food, EPIRB, handheld…

Gybe

See jibe — a turn in which the stern passes through the wind.

Genoa

A large headsail whose clew overlaps the mast, giving extra upwind drive compared with a w…

GNSS

Global Navigation Satellite System — the umbrella term covering all satellite positioning …

G.M.T.

Greenwich Mean Time — the mean solar time at the prime meridian in Greenwich, London. Now …

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