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May a "landlubber" comment? - was[ Help create better charts]
On Sun, 18 Jul 2010 09:56:35 -0400, "JR" wrote
(with clarity & insight): "Wayne R." wrote in message .. . On Sat, 17 Jul 2010 20:25:22 -0400, "JR" wrote (with clarity & insight): Washington DC and Fort Hood in upstate NY are just two places I have personal knowlege of where GPS is munged for security purposes. Regards, JR I've been using plain ol' GPS devices in & around DC for years with no issues. What am I missing? I have a Ram Mount in my GMC Yukon we use as a travel car, On this mount I place a laptop and more recentlya Netbook computer on the Ram and use MS Streets & Trips with a USB "puck" as the GPS receiver/antenna. On the many trips south from Pa to Fla as I use the DC Beltway and with the GPS in tracking mode it becomes "lost". The 1st time this happened I thought it was the unit itself and told it to recalculate the route from my current location. It couldnt determine my current location until we were merging back onto I-95. It simply didn't know where it was. Weather was not a factor (clear skies) nor was it a lack of GPS signal (it still showed as tracking 8 sats). This "problem" is repeatable 100% of the time on various trips thru the area. Similarly, During a trip for my daughters wedding and subsequent trips to Ft Hood, when approching base housing the same thing happens. Every time. When I asked my son-in-law about it he would only say "Yeah, kinda neat huh?" In conversations with my youngest daughters soon-to-be-husband who was home on leave from Jihadistan, he indicated that even there a few sites are so protected. Now, in northern NJ and northern Wi there are coverage gaps where the GPS can't resolve it's location, but these are a different situation as the unit tells me it can't find itself and why. Not so with the DC & Ft. Hood issues. Regards, JR I've found places where I've seen repeatable problems with one type of receiver but not another. (Sometimes problems come & go, and in those circumstances I've attributed it to constellation/reflection variations.) I've spent a lot of time near the White House, Pentagon, Ft. Meade, Langley, etc., in DC without any loss of lock - some of the places that seem most likely to have constant jamming? When your receiver "tells me it can't find itself and why", what does it say? |
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