Chapter 2 - Introducing the 961
961 Operations and Reference Manual Rev. D
Page 2-13
For details on interfacing the 961, see the
Northstar 961 GPS
Chart Navigator Installation Manual
.
Introducing GPS and DGPS
This section introduces the GPS and DGPS navigation systems,
and describes how these systems relate to the Northstar 961. If
you’re new to navigation, you may begin using your 961 with-
out understanding anything about these navigational con-
cepts. However, Northstar recommends that you read this
section at some point to become familiar with the concept of
GPS and DGPS.
What is GPS?
The United States’ Global Positioning System (GPS) is now fully
operational. Developed by the U. S. Department of Defense
(DOD), the GPS system comprises 21 active satellites with
three additional spares. Using these satellites, GPS encircles
the earth with navigation data.
Figure 3: GPS satellites communicating with vessel
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