Manual Garmin GPSMAP 172C (page 88 of 109) (English)

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Loran TD

Loran TD System

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 U.S. 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 collec-

tion 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 func-

tions 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. You must have

the correct chain number as well as the secondary station identiﬁers to use this option correctly. These

values varies per coordinate set or geographical location. Failure to enter correct information could

result in inaccuracies for the desired destination. After the waypoint is stored in unit memory, it always

references 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 reﬂects those changes. Since the GPSMAP unit 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.

On the Units Tab of the Main Menu, press

MENU, then highlight ‘Loran TD On’ and

press ENTER to select Loran TD.

Or, highlight the Position Format ﬁeld,

highlight ‘Loran TD’ and press

ENTER to

select Loran TD.

Appendix A

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Garmin GPSMAP 172C Manual

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