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194 | Appendix E - Glossary

SIGNAL-TO-NOISE RATIO (S/N)

Quantitative relationship between the useful and non-useful part of the received

satellite signal. A high S/N in dicates a good receiving condition.

S/N

See SIGNAL-TO-NOISE RATIO

SOFTWARE

Values programmed and preloaded into memory. The values represent a

permanent set of instructions for running the automatic functions (computations)

of the navigator.

SOG

See SPEED OVER GROUND

SOTDMA

Self Organized Time Division Multiple Access – An access protocol, which

allows autonomous operation on a data link while automatically resolving

transmission conflicts.

SPACE SEGMENT

The orbiting satellite part of the Global Positioning System.

SPEED OVER GROUND

Speed in relation to the sea bed.

SPHEROID

See ELLIPSOID.

STEERING COMPASS

The compass used for navigation. It may be a direct-reading compass from which

the heading may be entered into the navigator via the keyboard; or, it may be an

electronic heading sensor that enters heading data to the navigator via an optional

interface.

TDMA

Time Division Multiple Access – An access scheme for multiple access to the same

data link.

TIME OFFSET

The number of hours and minutes by which the TIME ZONE differs from UTC (see

below).

TIMEOUT

In the navigator, the automatic return to normal operation from edit mode if left

unattended. The timeout delay is set in CFG 1, Operation.

TIME ZONE

One of 24 longitudinal segments around the world, each generally 15 degrees and

1 hour wide. Please check locally for the exact time zone offset relative to UTC

(see below).

TRACK

In routes: The course lines between the waypoints.

In the plotter: The line showing the past movements of the vessel.

TRANSDUCER

A device that transfers power from one system to another in the same or in

different form. See also SENSOR.

TRIP LOG

In the navigator, an easily resetable sum log that accumulates the distance sailed

over ground based on the GPS signals. See also GPS LOG.

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