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Rev. D 3 — Basic Navigation
3 — Basic Navigation3 — Basic Navigation
3 — Basic Navigation Page 31
4.
Press the up and down cursor arrow keys to display
EXTERNAL
LRN
as the position source. If you change your mind, press
CLEAR
to restore the original setting; otherwise, press
ENTER,
then the
RETURN
menu key.
The loran display screen looks like this:
Press the
L/L TDS
menu key several times to select either the particular
pair of TDs you wish to use, or the loran-derived latitude/longitude.
The four-digit loran Group Repetition Interval (GRI) is changed using
the
SET GRI
menu key on the
LORAN POSITION
screen. You must set
this to correctly match the GRI being used by your loran receiver for the
941X to accurately convert the loran’s TDs to latitude/longitude position
fixes.
Loran warning indicators obtained from any Northstar 800 series loran
receiver are displayed to the right of each TD. These are:
loran TDs
NOTE
In order to display loran position coordinates on the 941X
from an externally-connected loran receiver, the loran must
support the standard NMEA 0183 “RMA” output data sentence
structure. Without this output capability, the 941X will not re-
ceive position data from the loran. For best results, connect a
Northstar 800 series loran to the 941X, using the 800’s
“PRINTER 3” output format. See “connecting to a Northstar
800 series loran” on page 123.
loran GRI
loran warnings