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Loran td setup – Garmin GPSMAP 296 User Manual

Page 148

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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 296 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. Location coordinates can be showed 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 does reflect those changes. Since the

GPSMAP 296 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 under the Units sub

tab in 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.

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GPSMAP 296 Pilot’s Guide

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