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TermDefinition
- AntifoulPaint applied to hull below waterline to discourage dirt and wildlife attaching and slowing your progress. Has environmental implications Read more
- Apparent WindThe wind we feel. If the true wind is hitting the boat on the beam or in front of the beam the apparent wind will be situated between the boat(...) Read more
- Did you know? As the crow flies The phrase "as the crow flies," meaning the most direct route, is believed to originate from the marine world. It refers to crows being(...) Read more
- AshoreOn the land; or aground Read more
- AsternThe area behind the stern (back) of the vessel Read more
- AIS An automatic tracking system used on ships and by vessel traffic services (VTS). AIS works over VHF and supplements marine radar, which(...) Read more
- Automatic Identification System An automatic tracking system used on ships and by vessel traffic services (VTS). AIS works over VHF and supplements marine radar, which(...) Read more
- AUV An Autonomous Underwater Vehicle (AUV) is a self-propelled, unmanned underwater vehicle capable of operating independently without direct human(...) Read more
- Autonomous Underwater Vehicle An Autonomous Underwater Vehicle (AUV) is a self-propelled, unmanned underwater vehicle capable of operating independently without direct human(...) Read more
- AutopilotEquipment that allows the boat steer a course automatically using either compass bearing or a course relative to wind direction Read more
- AuxiliaryA term for a saying a boat that has auxiliary power, i.e. an engine Read more
- AwashLevel with the surface of the water which just washes over an object Read more
- Baby StayAn inner forestay Read more
- Back The wind is referred to as backing (it backs) when it moves to blow from a direction that is anticlockwise from its current direction. A(...) Read more
- Back StayThe backstay runs from the top of the mast to the stern of the vessel. The backstay supports the mast and in some cases can be adjusted to(...) Read more
- BailTo remove water from the bilges or cockpit Read more
- BailerA utensil used to bail water out of a boat Read more
- BallA black signal shape displayed when a vessel is at anchor by day Read more
- BallastAdditional weight placed low in the hull to improve stability Read more
- BarA shallow area (shoal) close by a river mouth or harbour entrance or A measure of barometric pressure usually noted as 1000 millibars Read more