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Garmin GPSMAP3005C Manual

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GPSMAP 3005C Owner’s Manual 101
APPendIX > lorAn td systeM
LORAN TD System
LORAN-C is a radio navigation aid operated and maintained in the United States
by the United States Coast Guard. The LORAN (LOng RAnge Navigation)
system covers the entire United States and the U.S. Coastal Con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 TD for those who have a collection of LORAN xes for favorite shing
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 30 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 eld
before storing a waypoint. You must have the correct chain number as well as the
secondary station identiers to use this option correctly. These values vary for
each coordinate set or geographical location. Failure to enter correct information
could result in inaccuracies for the desired destination. After the waypoint is
stored in the unit’s memory, it always references the LORAN chain number
and secondary stations currently selected in the Setup TD eld. If you enter a
different LORAN chain number, change the secondary stations or offsets in the
Setup TD eld, the active waypoint information reects those changes.
Because the GPSMAP 3005C unit does not rely on the LORAN signal for
navigation, it can reference a different GRI chain or secondary stations and still
navigate to the location stored in memory.
The LORAN Position Format eld is located on the Units sub tab on the Main
Menu—System tab. The Loran TD Setup window contains the elds to select the
LORAN Chain Number, Primary and Secondary Stations, and TD Offsets.
To set up LORAN TD from the Main Menu:
1. Using the ROCKER, highlight the System tab, press right on the
ROCKER to highlight the Units sub tab. Highlight the Position Format
eld, and press ENTER.
2. Highlight Loran TD, and press ENTER, and then highlight the Setup
button to the right, and press ENTER again.
3. To change the settings of any of the ve elds, highlight the eld, press
ENTER, select the setting you want, and press ENTER again.
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 and adjusts 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 latitude/longitude coordinate (in the background)
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.
For more information on LORAN TDs, you can download Garmin’s Loran TD
Position Format Handbook from the Garmin Web site.
appendIX
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