Garmin GPS III Plus - Manual (Page 93)

83
REFERENCE
Setup Menu: Loran TD
Loran TD Setup Page
Selecting the Loran Chain
Number
LORAN TD Feature
The LORAN TD (Time Delay) feature eases the transition from using LORAN to using GPS.
The III+ unit automatically converts GPS coordinates to LORAN TDs for those who have a
collection of LORAN fixes for favorite fishing spots and other waypoints recorded as TDs. You
can display your position as a TD or enter waypoints as TDs. The accuracy to be expected
from this conversion is approximately thirty meters. When the unit is placed in the LORAN
TD format mode, it simulates the operation of a LORAN receiver. Position coordinates may
be displayed as TDs, and all navigation functions may be used as if the unit was actually
receiving LORAN signals.
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 unit memory, it will always reference the LORAN chain number
and secondary stations currently selected in the Setup TD field. If you enter a different LORAN
chain number, change the secondary stations or offsets in the Setup TD field, the active waypoint
information will reflect those changes. Since the III+ 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 Position Format field is located under the Position tab in the Main Menu. The
‘LORAN TD Setup’ window contains the fields where the Loran GRI-Chain Number, Primary &
Secondary Stations and TD Offsets are selected.
To setup Loran TD from the Main Menu:
1. With the Position Format set to 'Loran TD', press MENU
2. Highlight ‘Setup Loran TD’, press ENTER/MARK
3. To change the settings of any of the five fields, highlight the field, press ENTER/MARK,
select/enter the desired setting and press ENTER/MARK.
4. When done, highlight 'Save' and press ENTER/MARK.