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In article <24300011@silver> commgrp@silver.bacs.indiana.edu writes:

>How  does the DECCA navigation system work?   My understanding is 
>that it's a British or European system similar to LORAN-A.  There 
>are  several "chains" of transmitters 70 and 130  kHz.   What  is 
>DECCA's range,  coverage area, and signal format?

Its orgin is British.
The DECCA system works with chains of 4 transmitters. (1 master
and 3 slaves). They transmit on the frequention range of 70 to
130 Khz. The frequentions are subharmonic related (about a few
KHz). The system works with fase-relations between the trans-
mitters. Those relations named lanes and are hyperbolic lines
between transmitters on a special chart. There are a few modes
with different lane wides.

>I have seen no 
>DECCA  equipment advertized in marine electronics catalogs in the 
>U.S.   Is  it used in the Western or  Southern  hemispheres?   Is 
>DECCA  considered  a modern system?  

The DECCA system was born in ww2 and patended by decca corparation.
They own all the equipment and only hiring out the recievers.
Only in the last few years you can buy recievers from other firms.
The DECCA system is used in the hole West European coast and japan.
DECCA is an old system, but it works with a good accuracy.

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