Garmin GPSMAP 168 Sounder - Manual (Page 95)

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Appendix A
Loran TD
When inputting Loran coordinates, you must have the correct chain number, secondary
station identifi ers (fi rst and second), and proper map datum available for the TD
coordinates you input into the GPS unit. For better position accuracy, navigate to the
Loran point, then re-mark the point with a GPS unit in LAT/LON format.
To setup Loran TD from the Main Menu:
1. Using the ARROW KEYPAD, highlight the ‘Units’ tab and then the ‘Position Format’ fi eld and
press ENTER/MARK.
2. Highlight ‘Loran TD’, press ENTER/MARK, then highlight ‘Setup’ and press ENTER/MARK.
3. To change the settings of any of the fi ve fi elds, highlight the fi eld, press ENTER/MARK, select/enter
the desired setting and press ENTER/MARK.
4. When done, press the QUIT key to return to the Main Menu.
To setup Loran TD from the Status Page:
1. Press MENU, then use the ARROW KEYPAD, highlight the ‘Loran TD On’ and press ENTER/
MARK.
2. To change the settings of any of the fi ve fi elds, highlight the fi eld, press ENTER/MARK, select/enter
the desired setting and press ENTER/MARK.
3. When done, press the QUIT key to return to the Status Page.
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.
Loran TD Setup Page
Selecting the Loran Chain Number.
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168 Manual Part 2.indd 84 11/18/2002, 3:38:08 PM