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GPSMAP 176/176C Owner’s Manual 89
APPENDIX > LORAN TD
The LORAN Position Format field is located under the Setup–
Location tab in the Main Menu. The LORAN TD Setup window
contains the fields to select the Loran GRI-Chain Number, Primary
and Secondary Stations, and TD Offsets.
To set up Loran TD from the Main Menu:
1. Press MENU twice to display the Main Menu.
2. Using the ROCKER, highlight the Location Format field on
the Setup–Location Tab and press ENTER.
3. Highlight Loran TD and press ENTER.
4. Highlight Setup and press ENTER.
5. To change the settings of any of the five fields, highlight the
field, press ENTER select/enter the desired setting, then press
ENTER.
6. When done, highlight Save and press ENTER.
If the active GRI Chain, secondary stations, or offsets have been
changed since the waypoint was created, the waypoint now references
the active GRI-chain and secondary stations. You must adjust the
TD coordinates 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 before storing the
waypoint to memory or using it for navigation. Because of this, the
unit can navigate to a TD coordinate anywhere in the world.
You must know your GRI chain number and secondary stations to
create a LORAN TD position. For more information please read our
LORAN TD Position Format Handbook, available at the Garmin Web
site (www.garmin.com/support/userManual.jsp.)