Garmin GPSMAP 376C - Manual (Page 132)

LORAN TD Setup
LORAN C is a radio navigation aid operated and maintained in the
United States by the United States Coast Guard. The name LORAN
is an acronym for “LOng RAnge Navigation.” The LORAN
system covers the entire United States and the United States
Coastal Confluence Zone. From the perspective of a mariner, the
system is used for ocean and coastal navigation. It can be used as a
supplemental system for harbor and harbor approach navigation, and
it is used for inland navigation by recreational vehicles.
LORAN TD Feature
The LORAN TD (Time Delay) feature eases the transition from
using LORAN to using GPS. The GPSMAP 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 show your location as a TD
or enter waypoints as TDs. The accuracy to be expected from this
conversion is approximately thirty (30) meters. When the unit is
placed in the LORAN TD format mode, it simulates the operation
of a LORAN receiver. Position coordinates might be shown as TDs,
and all navigation functions can 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 always reference the LORAN chain
number and secondary stations currently 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 will reflect those changes. Since the GPSMAP
376C 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 Location Format field is located on the System
Tab—Location sub 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.
12 GPSMAP 376C Owner’s Manual
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