Garmin GPSMAP 278 User 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.

GPSMAP 278 Owner’s Manual

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