 V  |
| Vane |
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A flat device that is affected by the wind. Vanes are used in wind direction indicators and some self steering gear systems.
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| Vang |
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A hydraulic ram or block and tackle used to hold the end of the boom down.
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| Variable Pitch |
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A type of propeller that has adjustable blades for varying speeds or directions, and may be able to reduce drag when under sail.
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| Variation |
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Magnetic variation. The difference between magnetic north and true north, measured as an angle. Magnetic variation is different in different locations, so the nearest compass rose to each location on a chart must be used.
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| Vector |
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A line drawn to indicate both the direction and magnitude of a force, such as leeway or a current.
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| Veer |
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A shifting of the wind direction, opposite of backing. Clockwise in the northern hemisphere, counter-clockwise in the southern hemisphere.
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| Velocity Made Good |
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Also VMG. Actual boat speed after adjusting for such factors as current and leeway.
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| Vertical Clearance |
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The distance between the water level at chart datum and an overhead obstacle such as a bridge or power line.
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| Very Quick Flashing |
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A navigational aid with a light that flashes between 80 and 159 times per minute. Usually around twice per second.
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| Vhf |
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(1) Very High Frequency radio waves. (2) A radio that transmits in the VHF range. VHF radios are the most common communications radio carried on boats, but their range is limited to "line of sight" between the transmitting and receiving stations. Also see single sideband.
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| Visual Bearing |
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A bearing taken by visually observing the location of known landmarks.
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| Visual Fix |
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A fix taken by visually observing the location of known landmarks.
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| Vmg |
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Velocity made good. Actual boat speed after adjusting for such factors as current and leeway.
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