Chapter 5 - Determining Position Coordinates
951/952 Operator’s Manual Rev. B Page 69
Viewing loran
warnings
Three loran warning indicators obtained from any Northstar
800 series loran receiver are displayed to the right of each TD.
These indicators are available only from Northstar 800 series
lorans.
The L/L indicator to the left of a TD designates it as one of the
two TDs that the loran receiver has chosen to use to calculate
latitude and longitude.
The F/L indicator to the left of a TD indicates that it has been
forced to be used to calculate latitude and longitude.
Viewing loran info
To check the quality of signals being received by your loran,
press the menu key from the LORAN POSITION
screen. The SNR for each loran transmitting station is dis-
played graphically on the LORAN INFO screen. Press
to return to the LORAN POSITION screen.
Checking GPS status
To display GPS coordinates and signal status, press the
menu key. The unit continues to navigate using loran,
and will display loran data the next time you return to the
LORAN POSITION screen.
Returning to GPS
navigation
To return to GPS signals for navigation, repeat the steps shown
for selecting loran in “Selecting loran” on page 67, except spec-
ify GPS instead of loran.
Table 5: Definitions of loran warning indicators
Indicator Meaning
SNR
Signal-to-Noise Ratio is low—use caution
BLNK
Coast Guard is transmitting a blink signal, indicat-
ing a probable transmitter problem
CYC
The receiver has detected a possible cycle slip
LOCK
The receiver has locked onto the loran track point
(this isn’t a warning indicator, but an indication of
normal performance)
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