Garmin GPSMAP 238 Sounder - Manual (Page 113)

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Appendix D
Loran TD
To select the Loran TD position format:
1. On the Units tab of the Main Menu, press MENU , highlight ‘Loran TD On’ and press ENTER .
OR:
1. On the Units tab of the Main Menu, highlight the Position Format fi eld and press ENTER .
2. Highlight ‘Loran TD’ and press ENTER .
The ‘LORAN TD Setup’ window contains the fi elds to select the Loran GRI-Chain Number, Primary
and Secondary Stations, and TD Offsets.
To setup Loran TD from the Main Menu:
1. Highlight the Setup button (next to ‘Loran TD’ in the Position Format fi eld) and press ENTER.
2. To change the settings of any of the fi ve fi elds, highlight the fi eld, press ENTER, select/enter the
desired setting and press ENTER.
3. Press QUIT to return to the Main Menu.
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 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 (in the background) 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.
For more information on Loran TDs, you may download Garmin’s “Loran TD Position Format
Handbook” from the Garmin web site at http://www.garmin.com/support/userManual.html.
Loran TD Setup Window
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