"Harry Andreas" wrote in message
...
In article , "Paul J. Adam"
wrote:

The trouble is, GPS is too damn useful. Mike Marron wrote eloquently
about how a working GPS can replace most of your flight instruments...
as long as the GPS is working. But it's a low-powered signal from orbit
and it's easily jammed. GPS jamming isn't a feature of civilian life,
but it's a serious military problem. GPS offers much more than any other
navaid I've heard of, no wonder people turn to it first.

Oh Bo....ks.
GPS is easy to TRY to jam. Well known signal processing techniques are
all that's required to defeat jamming.

GPS is neither "easy to jam", or an apropriate "replacement" for existing
navigation systems. While Mike may have spread the snake oil in a manner
pleasing to our ground pounder lune Paul, an instrument cross check is a
necessity to maintain safe operations. Fused navigation sensors wisely take
this instrument cross check and make it part of the automation; but as Ed
points out, relying on only one instrument often results in errors.

John P. Tarver, MS/PE