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There are 98 entries in the glossary.
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Term	Definition
Race	(1) A strong, confused tide or current. (2) A competition of skill and seamanship between yachts.

Rack	The operation of temporarily holding two lines together by seizing.

Radar	Radio Detection and Ranging. An electronic instrument that uses radio waves to find the distance and bearing of other objects. Used to avoid collisions, particularly in times of poor visibility.

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

Radar Reflector	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.

Radiation Fog	Fog over land caused by condensation of vapor in the air above cooler ground.

Radio	An instrument that uses radio waves to communicate with other vessels. VHF very high frequency - radios are common for marine use, but are limited in range. Single Side Band SSB - radios have longer ranges.

Radio Beacon	A navigational aid that emits radio waves for navigational purposes. The radio beacon's position is known and the direction of the radio beacon can be determined by using a radio direction finder.