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GPSMAP 188/188C Sounder Owner’s Manual 109
APPENDIX > LORAN TD SYSTEM
The LORAN Position Format field is located on the Setup–
Location tab on 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.
To set up Loran TD from the Main Menu:
1. Press MENU twice to display the Main Menu.
2. Using the ROCKER, highlight the Position Format field on
the Units tab, and press ENTER.
3. Highlight Loran TD, and press ENTER.
4. Highlight Setup, and press ENTER.
5. To change the settings of any of the five fields, highlight the
field, and press ENTER. Select or enter a setting, and then
press ENTER.
6. When finished, highlight Save, and press ENTER.
Loran TD Setup Page
If the active GRI Chain, secondary stations, or offsets were
changed since the waypoint was created, the waypoint now
references the active GRI-chain and secondary stations. You must
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 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.
You must know your GRI chain number and secondary stations
to create a LORAN TD position. For more information, read
our LORAN TD Position Format Handbook, available from the
Garmin Web site (www.garmin.com/support/userManual.jsp.)