Garmin LORAN TD position format handbook

Loran TD

position format handbook

© 1999 GARMIN Corporation

GARMIN International, Inc.

1200 East 151st Street, Olathe, Kansas 66062, U.S.A. Tel. [phone] or 800/800.1020

Fax [phone]

GARMIN (Europe) Ltd.

Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K.

Tel. [phone]

Fax [phone]

GARMIN (Asia) Corporation

No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan

Tel. [phone]

Fax [phone]

All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without prior written consent of GARMIN Corporation. GARMIN Corporation hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed for personal use, provided that such electronic or printed copy of this manual contains the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual is strictly prohibited.

Information in this manual is subject to change without notice. GARMIN

Corporation reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes. Visit the GARMIN website (www.garmin.com) for current updates and supplemental information concerning the use and operation of this and other GARMIN products.

GARMIN is registered trademark of GARMIN Corporation and may not be used without the express permission of GARMIN Corporation.

December 1999

Part Number 190-00190-00 Rev. A

As a convenience to our customers that have used Loran C as their primary source of navigation, we are now including a

Loran TD position format in our marine GPS products.

The new Loran TD Position Format will allow our customers to enter Time Difference (TD) coordinates into their GARMIN GPS. When a Loran C, TD coordinate is entered in a GARMIN GPS, the coordinate will go through a conversion that makes it GPS friendly. The converted coordinate can be used for immediate navigation and/or stored for future use.

For those unfamiliar with Loran C, but want to use TD coordinates in your GARMIN GPS, it will help to have a basic understanding of Loran C and it’s components. This booklet is designed to provide you with enough basic knowledge of Loran C to allow you to setup and use the GARMIN Loran TD Position Format.

Loran TD Position Format

SIGNAL	9610
GRI
SEC	TD
V	14874.6
SEC	TD
W	32128.1

1

9960 (Y)

Loran TD Position Format		Loran C is a radio navigation system, operated and maintained
		in the United States by the Untied States Coast Guard. The name
		Loran is an acronym for ‘LOng RAnge Navigation’.
		The Loran C system covers the entire United States and the U.S.
		Coastal Confluence Zone. From a mariner’s perspective, the Loran C
		system is used primarily for ocean and coastal navigation. It can be
			used as a supplemental system for harbor and harbor
9940 (W)	8970 (Y)	9960 (W)	approach navigation, and for inland navigation by
	9610 (V)	8970 (X)	recreational vehicles. Loran C will be phased out as a
9940 (X) 9940 (M)		9960 (M)	primary source of navigation, but should remain active
	8970 (M)
		9960 (X)	until after the turn of the century. It will be replaced by
	9960 (Z)
9610 (W)
9940 (Y)			GPS. The Global Positioning System provides greater
	8970 (Z)

accuracy and world wide coverage.

9610 (X)		8970 (W)
		9610 (Z)
		The Loran C system consists of groups of land based
	9610 (Y)	transmitter stations called chains. A chain contains a Master
		station (M) and at least two, but more commonly 4 or 5 Second-
		ary stations designated (V) Victor, (W) Whiskey, (X) Xray, (Y) Yankee,
		and (Z) Zulu. These stations are separated by several hundred miles.

9610 Master Station and 8970 (Z) Zulu Station share a common transmitter.

2

Many of the Loran C transmitter stations serve multiple roles. A transmitter can serve as a Master Station for one chain and a secondary station for multiple chains. An example would be chain 9610’s Master Station and chain 8970’s Zulu Station. These operate from the same transmitter located in Boise City, OK.