Garmin GPSMAP 278 - Manual (Page 118)

Using the LORAN TD Format
When creating new waypoints using LORAN TD coordinates,
you must set the correct LORAN chain number and secondary
stations in the Setup TD field before storing the waypoint. After
the waypoint is stored in the unit’s memory, it always references
the LORAN chain number and secondary stations selected in the
Setup TD field. If you enter a different LORAN chain number or
change the secondary stations or offsets in the Setup TD field, the
active waypoint information reflects those changes. Because the
GPSMAP 278 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 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. Highlight the Setup tab on the Main Menu, and then highlight
the Location sub tab.
2. Highlight the Location Format field, and press ENTER.
3. Highlight Loran TD, and press ENTER.
4. Highlight the Setup button located on the right side of the
Location Format field, and press ENTER. The Loran TD
Setup window appears.
LORAN TD Setup
5. To change the settings of any of the five fields, highlight the
field, press ENTER, select a setting using the ROCKER, and
press ENTER AGAIN.
6. When finished, highlight the Save button, and press ENTER.
If the active GRI Chain, secondary stations, or offsets were changed
since the waypoint was created, the waypoint references the active
GRI chain and secondary stations and adjusts 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 latitude and longitude 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.
For more information on LORAN TDs, you can download the
LORAN TD Position Format Handbook from the Garmin Web site.
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