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Author Topic:   LORAN Status
gss036 posted 08-19-2010 07:28 PM ET (US)   Profile for gss036   Send Email to gss036  
The last couple trips I turned on my LORAN [receiver] and it could not find a signal here in the San Juan Islands. I do have [a] GPS [receiver] but really like the LORAN [system] for compass headings in the fog--like there was here two weeks ago. I stopped by a radar shop and the kid there says as far as he knows, [the LORAN system] is a thing of the past. If that is the case, I guess I can remove another antenna from my boat.
Jkcam posted 08-19-2010 07:48 PM ET (US)     Profile for Jkcam  Send Email to Jkcam     
I believe that LORAN has been phased out by the USCG as of August 3, 2010. That August 3 date phase out was the Canadian Loran by the USCG. Do a web search and you will find more than you want to know. Maybe you could use it as a paper weight.
jimp posted 08-19-2010 08:07 PM ET (US)     Profile for jimp  Send Email to jimp     
Yes, it is gone and many of the towers are slated for demolition. Time to throw the LORAN C in the garbage - they will never work again and you can't sell them as there are no buyers.


gss036 posted 08-19-2010 08:42 PM ET (US)     Profile for gss036  Send Email to gss036     
Thanks for the info. No, I don't want to throw it away as it is combination unit and works great for the depth sounder and the paddle wheel for water passing under the boat. The GPS just give speed over the water.
jimh posted 08-19-2010 09:10 PM ET (US)     Profile for jimh  Send Email to jimh     
LORAN was shut down earlier this year.
jimp posted 08-19-2010 10:08 PM ET (US)     Profile for jimp  Send Email to jimp     
For clarification, the CONUS stations and four of six Alaska stations (Attu and Shoal Cove stayed open) were shutdown in Feb and the Russian-American Chain and Canadian Chain in August (Attu and Shoal Cove shut down).


jimh posted 08-20-2010 07:31 AM ET (US)     Profile for jimh  Send Email to jimh     
LORAN-C was a global system, and it may still be operating in regions other than North America.

The typical marine GPS receiver does not measure speed directly, and certainly not speed through the water. Most GPS receivers computes speed over ground by calculating the time interval between position fixes. Errors in position affect the speed accuracy. A few specialized GPS receivers have been produced for marine use which measure speed over ground directly by using a Doppler shift technique, however use of these devices is generally limited to speed record competitions. None of the common GPS receivers sold for marine applications measure speed directly.

jimh posted 08-20-2010 07:40 AM ET (US)     Profile for jimh  Send Email to jimh     
jimh posted 08-21-2010 06:18 AM ET (US)     Profile for jimh  Send Email to jimh     
I am not sure how the presence of fog plays a role in choosing which position locating system to prefer, LORAN or GPS. About the only insight I can make there is perhaps in certain fog conditions the suspension of water droplets in the air would attenuate the radio signals from the GPS satellites, causing a GPS receiver to lose its position fix. Is that what was meant?
jimh posted 08-21-2010 06:19 AM ET (US)     Profile for jimh  Send Email to jimh     
Also, I do not see how the fog, LORAN, or GPS could affect the use of a compass to get a heading in the fog. A compass should operate as well in fog conditions as in fair weather.

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