This was discussed quite diligently after 9/11. The fact of the matter is
that with an airplane and $5k in parts, anybody that wanted to could blow
GPS away over tens of thousands of square miles for as long as they wanted
to.

It is a real witch to blow away a megawatt transmitter for more than a few
hundred feet.

Jim



"Bob Gardner" wrote in message
...

You and Roger should both look at this. I have visited Locus, Inc., where
the all-in-view technology was developed; I have visited (as I said
before) the very active USCG loran operating HQ in California. I have seen
plots of flights comparing enhanced loran to GPS. I have seen the future
of loran.