Just found out something interesting...LORAN is coming back! LORAN was the precursor to GPS and was developed and used during WWII. It seems that the English have a Plan B for their ships at sea in case GPS ever goes completely out...eLORAN.
Here's a link to the article: http://forums.qrz.com/showthread.php?456124-UK-rolls-out-GPS...
What's 'old' is 'new' again!
...has some new wrinkles in signal processing and coding, but a lot of folks have realized the need for a non-GNSS based solution for position, navigation, and time.
But, may fail due to lack of adoption. I believe only 7 stations have it in the UK so far.
The issue in the UK is there are so many GPS signal jammers in use along the Channel that ships could not rely on sat signals for position. Oh, it gets a little on the foggy side there occasionally also.
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