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| Word |
Description |
| rate gyro |
A special kind of gyroscope that measures rotation rate around a fixed axis. |
| relative bearing |
Bearing relative to heading or to the vessel. |
| relative wind |
The speed and relative direction to from which the wind appears to blow with reference to a moving point (also called Apparent Wind). |
| repeatability |
The maximum variation between repeated measurements under the same conditions. |
| resolution |
The smallest change that a sensor can measure. |
| rhumb line |
A line on the surface of the earth making the same oblique angle with all meridians. A rhumb line is a straight line on a rhumb (or Mercator) direction. |
| rhumb lirection |
The horizontal direction of a rhumb line, expressed as angular distance from a reference direction. Also known as Mercator direction (see Mercator Map Projection). |
| RMA sentence |
Recommended Minimum Acceptable Sentence, a composite sentence recommended by the NMEA 0183 standard to insure interoperability between talkers and listeners and to insure that all data considered necessary for navigation is sent by a particular navigation unit. |
| rode |
The anchor line and/or chain. |
| roll |
Rotation around the X-Axis. In a vessel, roll is rotation about the axis defined by the vessels fore-and-aft center line. |
| rope |
In general, cordage as it is purchased at the store. When it comes aboard a vessel and is put to use it becomes line. |
| route |
A planned course of travel, usually composed of more than one navigation leg. |
| route system |
Any system of one or more routes and/or routing measures aimed at reducing the risk of casualties during a voyage which may include such items as traffic separation schemes, recommended tracks, restricted areas, inshore traffic zones, etc. |
| RS-232 interface |
Standard serial interface for PC-type computers. |
| rudder |
A vertical plate or board for steering a boat. |
| run |
To allow a line to feed freely. |
| running sights |
Lights required to be shown on boats underway between sundown and sunup. |
