NorthStar 957 Operator's Manual page 70

Chapter 5 - Determining Your Position
Viewing Phantom
Loran TDs
Setting Phantom
Loran GRI
Checking GPS status
Checking DGPS
status
Page 62
Press the L/L TDS menu key several times to display either the
particular pair of TDs you want to use, or the GPS-derived
latitude/longitude.
Press the SET GRI menu key to change the GRI to be used in
calculating the displayed TDs. Press the CURSOR PAD to
display the available GRIs one at a time. When the GRI is
correct, press the ENTER key.
Press the SAT INFO menu key to display the status of the GPS
receiver.
Press the DGPS INFO menu key to display the current status
of the differential receiver, including SNR, SIGNAL, and NOISE
values.
957 Operator's Manual, Rev. B