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    Re: Over-reliance on GPS
    From: Jeremy C
    Date: 2008 Nov 13, 04:37 EST
    Lu writes:
    "Carl, let's be careful here.   LORAN was primarily deployed in North America (I believe there was also some coverage in the Pacific due to US territories there and Japan also operated a chain).   Loran is being brought back in the US.  I don't know about Canada and I'm pretty sure it's not being resurrected in the Pacific.   So while it's great (I did a lot of precision electronic navigation using Loran way before GPS) Loran certainly doesn't provide the worldwide coverage provided by GPS."

    LORAN isn't being "brought back" so much as enhanced as Carl mentioned.  eLORAN will have an additional signal encoded in it to enhance accuracy among other improvements.  There is a good article on the USCG website about it that I would link to except that I have only sporadic email here at sea and no Internet connection.
    The Japan/Guam chain is still going strong, and of course the chains on the US coasts are there as well.  Lu is correct that it gets sketchy outside of groundwave coverage, and is certainly just a mid-ranged system that should compliment GPS nicely out to several hundred miles from the stations.
    What will be interesting to see is the EU version of GPS (I forget the name) which should then offer us two independent systems of deep sea electronic navigation which will give us a third navigation system in the deep oceans.  I look forward to that.

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