NorthStar 957 - Displaying Position, Heading, and Speed; Using GPS

Page 52 957 Operator’s Manual, Rev. B
Chapter 5 - Determining Your Position
Displaying position, heading, and speed
The 957 uses a high-performance GPS receiver as its primary
source of position data, augmented by either the WAAS
satellite system, or radiobeacon differential, or both.
Depending on the type of antenna/receiver that’s connected,
the 957 can determine and display position coordinates in
several different ways:
•
as lat/lon coordinates
>
from GPS satellites alone
>
from GPS plus the radiobeacon differential system
>
from GPS plus WAAS satellites
NOTE:
The 957 can display position as Loran TDs if the 957 is connected to a
loran receiver. Also, it can display “Phantom Loran” coordinates; that is, if
you don’t have a loran receiver, but want to see your position as loran
TDs, the 957 will convert GPS coordinates into Loran coordinates.
Using GPS
Position, COG, and SOG are calculated from the received
satellite data, as well as time, date, and an estimate of the 957’s
accuracy. To display this position information, press the
CHART key to display the GPS POSITION screen.