"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 recently
a 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