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Marine Electronics Knowing where our dive spots are located and what is the depth for our dives make our marine electronics very important.

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Old 08-07-2017, 06:43 PM   #1
techwiz44
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LORAN is coming back, not LORAN-C, eLORAN as a backup for navigation

https://arstechnica.com/gadgets/2017...because-cyber/

An evolution of World War II technology (LORAN was an acronym for long-range navigation), Loran-C was considered obsolete by many once GPS was widely available. In 2010, after the US Coast Guard declared that it was no longer required, the US and Canada shut down their Loran-C beacons. Between 2010 and 2015, nearly everyone else shut down their radio beacons, too. The trial of an enhanced Loran service called eLoran that was accurate within 20 meters (65 feet) also wrapped up during this time.

But now there's increasing concern about over-reliance in the navigational realm on GPS. Since GPS signals from satellites are relatively weak, they are prone to interference, accidental or deliberate. And GPS can be jammed or spoofed—portable equipment can easily drown them out or broadcast fake signals that can make GPS receivers give incorrect position data. The same is true of the Russian-built GLONASS system.

Over the past few years, the US Coast Guard has reported multiple episodes of GPS jamming at non-US ports, including an incident reported to the Coast Guard's Navigation Center this June that occurred on the Black Sea. South Korea has claimed on several occasions that North Korea has jammed GPS near the border, interfering with aircraft and fishing fleet navigation. And in the event of a war, it's possible that an adversary could take out GPS satellites with anti-satellite weapons or some sort of cyber-attack on a satellite network.

--cut for brevity--

the version of the Department of Homeland Security funding bill for 2018 just passed by the House of Representatives in July includes language calling for DHS to fund the construction and maintenance of a new eLoran system "as a complement to, and as a backup for" the GPS system.
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Old 08-08-2017, 04:38 AM   #2
sealark
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Re: LORAN is coming back, not LORAN-C, eLORAN as a backup for navigation

I think a MOAB dropped would be much cheaper than messing with a perfect GPS system. But then I would like to see dead reckoning to find fishing spots come back in. It's so easy for a 10 year old to drive the boat to a fishing spot on the map with GPS.
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