82
SECTION
H
APPENDIX
Loran TDs
information will reflect those changes. Since the GPSMAP unit does not rely on
the LORAN signal for navigation, it can reference a different GRI chain and/or
secondary stations and still navigate to the location stored in memory.
The LORAN Position Format field is located in the Navigation Setup Menu. After
the 'LORAN TD' format is selected, a new option will appear over the
M
key
called 'Setup TD'. The 'LORAN Setup' page contains the fields where the
LORAN GRI-Chain Number, Primary & Secondary Stations and TD Offsets are
selected.
To change the “Setup TD” settings:
1. Press the
M
under SETUP TD.
2. Use the
K
key to select the field to change and press
C
.
3. Use the
K
key to highlight the new setting and press
C
.
4. When done, press the
M
key under the word EXIT to exit.
If the active GRI Chain, secondary stations or offsets have been changed since the waypoint
was created, the waypoint will now reference the active GRI-chain and secondary stations
and the TD coordinates will be adjusted accordingly. Remember that the GPS is not relying on
the LORAN signal for navigation and actually converts the TD coordinate to a useful LAT/LON
coordinate (in the background) before storing the waypoint in unit memory or using it for
navigation. Because of this the unit can navigate to a TD coordinate anywhere in the world.
I
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