Enhanced loran
If you thought loran was being phased out — and you won’t be alone thinking that — well, loran isn't leaving. It now has what seems to be a permanent backup role to GPS. But it won’t be the loran-C that, since about 1980, fishermen have relied on to return to a fishing spot or string of gear. This is an enhanced version, thus called e-loran; it is supposed to provide greater coverage and have an accuracy of 8 to 65 feet, as opposed to 0.25 to 1 nautical mile for loran-C.
GPS is a marvelous navigation tool, but it has a couple of big problems. It is susceptible to jamming and interference, and it appears that al-qaeda and other militia groups in the deserts of Iraq and Afghanistan took advantage of this weakness. In some cases, convoys were getting lost in the desert because GPS satellite signals were being jammed. Since loran is a land-based communication system it is not as susceptible to interference as a satellite system.
e-loran is not a 2008 concept. The idea has been around for a number of years; from 1999 to 2006, improvements —$160 million worth — were made to loran-C stations to make them suitable for a future e-loran.
Those improvements include upgrading existing transmitting equipment; positioning techniques similar to GPS; new channels for better position and time accuracy, and installing all-in-view equipment. The last feature means that e-loran is no longer a “chain” system, with a master and two secondary stations. E-loran will use however many stations are in range to arrive at a navigation fix.
Nineteen of the 24 loran-C stations have been modernized to transmit e-loran signals.
An administrative change coming with e-loran is that until 2009 the Coast Guard will remain the agency in charge, after that the Department of Homeland Security’s National Protection and Programs Directorate will take over.
Probably because of the uncertainty surrounding loran’s future, manufacturers of loran equipment stopped developing products. So, instead of a number of e-loran products to compare, there are only two e-loran receivers available in the United States.
One is Si-Tex’s e-Loran Integrated GPS/Loran Receiver Sensor, and the other is the eLGPS1110 integrated GPS/loran sensor from CrossRate, a company in Standish, Maine.
Even Si-Tex discontinued its loran products some five years ago, but because its parent company Koden was working with the government on an e-loran project, Si-Tex had a pretty good idea loran won’t be abandoned, and thus came up with its new receiver.
Lastly, if you want to continue using your loran-C receiver to get a fix, you can. You just won’t be able to take advantage of e-loran's accuracy and coverage improvements.
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