Manual Garmin GPSMAP 3010C (page 82 of 96) (English)

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Getting Started

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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 Conﬂ uence 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 ﬁ xes for favorite ﬁ shing spots and other waypoints recorded as TDs. You can display your posi-

tion 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 ﬁ eld before storing the waypoint. You must have the

correct chain number as well as the secondary station identiﬁ ers 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 ﬁ eld. If you enter a

different LORAN chain number, change the secondary stations or offsets in the Setup TD ﬁ eld, the active

waypoint information reﬂ ects 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.

The LORAN Position Format ﬁ eld is located under the Units tab in the Main Menu. The ‘LORAN TD

Setup’ window contains the ﬁ elds to select the Loran GRI-Chain Number, Primary and Secondary Stations,

and TD Offsets.

Select ‘Loran TD’, then highlight the

‘Setup’ button and press ENTER.

Appendix D

Loran TD

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Garmin GPSMAP 3010C Manual

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