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POS 4
The POS 4 screen brings up the coordinates of
the destination
waypoint
to the screen so you can
compare the numbers. TDs are shown here be-
cause matching the TD coordinates is an ideal
way to return to a favorite wreck for fishing, TDs
are stored in the waypoint memories any time
you save a location as an Event or by direct entry
14096.2Irs
26160.4~s
of TDs as a
waypoint
location. TDs are not saved
when Lat/Lons are entered as waypoints.
Note also, that the sensor mode in use here is the Loran-C. The NAV 398,
when operating in the GPS mode can convert the GPS Lat/Lon readouts into
GPWLoran
Time Differences
(TDs].
Some users may find this calculation
useful to reference with their old loran coordinate logs.
The Loran GRI and the desired TD lines must be intitially entered in the
GPS Setup mode before this conversion page can work properly. However
having entered the required initial data, the conversion program can operate.
CAUTION
When TDs readouts are the result of calculations made from GPS derived
Lat/Lon data, the GPS signals are not subject to the same propagation errors
as loran signals and therefore will not match actual loran TD measurements
precisely. The TD readouts obtained from GPS are for relative comparison
only.
POS
5
If you press
thelpos/llkey
one more time, the
POS 5 screen appears and the readouts now
include displays of the course-made-good
(CMG), and velocity-towards-destination
(VTD). This readouts show the overall course
direction that you have made since starting
towards the current destination and your appar-
ant speed. The readouts are of particular inter-
est to sailboaters.
N
34O14.714'
w 118" 35.236'
OPERATION 3-10
:
.
-
.-
23


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