NorthStar 941x 사용자 설명서

Rev. D

Glossary

Page 135

GLOSSARY

accuracy

accuracy: absolute accuracy—the accuracy of displayed lat/long coordi-

nates of your present position as compared to lat/long determined
from a chart or other reference source.

repeatable accuracy—the ability to return to the same location

using a receiver’s previously-obtained coordinates.

acquisition

acquisition: The procedure during which a GPS receiver attempts to

track satellites before a position fix can be computed.

almanac

almanac: Data describing the precise orbits of GPS satellites, obtained

automatically from satellite signals and stored in a GPS receiver.
The receiver requires about 15 minutes to collect almanac data the
first time it is turned on. Thereafter, it can usually use the alma-
nac data collected previously.

chain

chain: A group of loran transmitters comprised of a master station and

at least two secondaries.

coverage

coverage: The extent to which a geographical area is encompassed by

usable GPS or loran signals.

cursor

cursor: The display panel indicator that shows which character or char-

acter field is ready to be changed, acknowledged, or entered by
the user. It is activated and positioned by the user when required.
The 941X’s cursor will appear as an arrow or a flashing block, de-
pending on whether you are choosing or entering data.

ephemeris

ephemeris: Data used to calculate exact satellite positions, continually

updated and derived from information relayed to the 941X in each
satellite’s data stream.