NavList:

GPS jamming takes very little power.  The signal is actually very weak.  As for jamming, it's less likely to jam in the middle of the Ocean vice a harbour where ships would be more likely to run agound then be easily targeted.

And jamming is most likly conducted by a foregin power.  The US (as I stated in another post) still has Selective Availability at their disposal as well as spoofing.  Once those are active, only military and certain government recievers can accept encrypted siganls (which are still sent) and separate carrier waves (L1 and L2) from the satellite.

And some people may think there is no practical use for continuing training with a sextant.  Cross the Atlantic and Pacific again without GPS or DGPS (which has a limited range) and see how you do.  You'll be looking for that sextant.

Pete

> Bill, there is some question of exactly how easily the
> military signals (admittedly weak) can be jammed, but if
> you wanted to remove precision navigation capability from
> a radius of two or three thousand miles (say, over the
> Pacific and western Pacific Rim) it would require an awful
> lot of local jamming stations. If you wanted to take out a
> five thousand mile range (a penny in the bucket compared
> to the size of China) I suspect it would be cheaper and
> simpler to knock out the satellites.

Peter I. MacNeil
Lieutenant (N)
Fleet Navigating Officer Course
Serial 0601
NOTC VENTURE

"There can be only one!"