Garmin gpsmap 172 Manuale Utente

The LORAN Position Format field is located under the Units 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.

1.   Using the ARROW KEYPAD, highlight the ‘Setup tab, then press RIGHT to highlight the ‘Units’ 

submenu tab. Highlight the “Position Format” field and press 

ENTER. You may also press MENU 

from the “Units” tab to display the ‘Loran TD On’ option. (If you use ‘Loran TD On’, skip to step 3.)

2.  Highlight ‘Loran TD’, press ENTER, then highlight ‘Setup’ and press ENTER.
3.   To change the settings of any of the five fields, highlight the field, press ENTER, select/enter the 

desired setting and press ENTER.

4.   When done, press the QUIT key 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 now references 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.

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