Garmin 2006 Manuale Proprietario

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PPENDIX

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LORAN TD S

YSTEM

Federal users can obtain MMSI assignments from their agency radio spectrum 

management office. These procedures are currently under review by the NTIA 

(National Telecommunications and Information Administration).

Users can obtain an MMSI assignment from their telecommunications authority 

or ship registry, often by obtaining or amending their ship station license.

Industry Canada is responsible for assigning MMSI numbers to commercial and 

recreational vessels. Information is available at the following Web site:  

.

For more information regarding MMSIs visit:  

To receive Distress Calls or Position Reports, you must have a DSC-equipped 

chartplotter as well as a VHF radio with DSC support. During normal, non-

emergency Position Report communication, Channel 70 (156.525 MHz) has been 

set aside as the VHF/DSC digital call channel. 
For a Distress Call, a mariner presses the MayDay button on the VHF radio. 

The call transmits on an emergency channel with the MMSI number attached to 

the call (if you have DSC support). Any DSC-equipped mariner (on sea or land) 

within range can receive the call. 

LORAN-C is a radio navigation aid operated and maintained in the U.S.A by 

the United States Coast Guard. The LORAN (LOng RAnge Navigation) system 

covers the entire U.S.A. 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. 

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 fixes for favorite fishing 

spots and other waypoints recorded as TDs. You can show your position as a 

TD or enter waypoints as TDs. The expected accuracy 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 can 

be displayed as TDs, and you can use all navigation functions as if the unit was 

actually receiving LORAN signals.

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 a waypoint. You must have the correct chain number and the 

secondary station identifiers 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 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. Because