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GGlossary
T
his glossary contains general navigational terms as well as
terms found throughout the 961 Operations and Reference
Manual.
accuracy
Absolute accuracy—the accuracy of your present position's dis-
played lat/lon coordinates, compared with lat/lon 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
The procedure—and the time it takes—during which a GPS
receiver tries to track satellites, but before it actually computes
a position fix.
almanac
Data describing the precise orbits of GPS satellites, obtained
automatically from satellite signals, and stored in a GPS
receiver. The first time the receiver is turned on, it requires
about 15 minutes to collect almanac data. Thereafter, it usu-
ally can use the almanac data previously collected.
ARCS
Admiralty Raster Chart Service.
autopilot
An electronic compass-related steering aid that automatically
maintains a steady course.
baud rate
The speed at which data is output from the 961 (also the speed
at which data is output from other instruments interfaced to
the 961).
beacon
A radio transmitter operated by the U.S. Coast Guard that sup-
plies differential corrections to GPS receivers.
bearing
The magnetic course from your present position to a waypoint.
cartography
The science or art of map-making.
chain
A group of loran transmitters comprised of a master station
and at least two secondaries.
COG
Course-Over-Ground. The actual path of your vessel relative
to the surface of the earth; that is, the direction your vessel is
actually moving.
961 Operations and Reference Manual Rev. D
Page G-1
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