Measuring point for compressor acceptance test. Pressure at the compressor inlet flange.

An unusually strong wind. In storm-warning terminology, a wind of 34 to 47 knots (39 to 54 miles per hour or 62-87 kilometers per hour).

A boat in a dry dock.

A four sided sail used instead of a triangular main sail. Used on gaff rigged boats.

When all the sails are aback.

To attempt to contact another boat or shore, either by voice or radio.

An arch to mount the radar, usually at the stern of the boat.

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All the various sails carried on board a yacht.

An automatic pressure relieving device actuated by the static pressure upstream of the device, which opens in proportion to the increase in pressure over the opening pressure.

A pneumatic hand held percussive drill designed as a boring tool.

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A gauge that measures engine revolutions per minute.

is the ratio of the actual velocity at a given point to the velocity of sound in the same gas at the conditions existing at this point. These are known as local conditions.

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An object designed to increase the radio reflectivity of a boat so that it is more visible on radar. Many small boats are made with fiberglass and other materials that do not reflect radar very well on their own.

An inert gaseous element.