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Chapter 2 - Introducing the 961
System overview
GPS features
DGPS features
(961XD only)
Navigation features
Page 2-2
This section summarizes nine of the 961's major features: GPS;
DGPS; navigation; waypoints and routes; hardware; the
CHART screen; navigational chart CDs (the 961 is compatible
with HCRF charts—the format for ARCS charts—as well as
BSB-format charts); the TideTrack function; and the display of
currents.
The 961 offers the following GPS features:
•
12-channel GPS precision and dependability
•
accurate position data—worldwide
•
one-second update of position, speed, and heading
•
data available in any weather—24 hours a day
For the best in GPS accuracy, the Northstar 961XD features an
internal, two-channel DGPS receiver that accepts DGPS signal
corrections from shore-based transmitters called beacons.
These transmitting beacons emit radio signals, whereas many
other navigational beacons, such as buoys and lighthouses,
emit light signals.
The 961XD uses these DGPS signal corrections to display your
position (a position fix), as accurately as one to three meters.
The 961XD's DGPS feature offers:
•
a fully automatic DGPS beacon receiver
•
accuracy of one to three meters (one meter equals slightly
more than one yard)
•
continuous DGPS usage indicator on the CHART screen
•
one-second update of DGPS information
For details about DGPS, see "Differential GPS corrections" start-
ing on page 2-15.
The 961 has two separate, high-resolution, color chart views
that show:
•
your vessel's present position
961 Operations and Reference Manual Rev. D
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