Steven P. McNicoll wrote:
"Peter R." wrote in message
...

Most likely because in its current form, GPS availability is controlled by
the US Gov't. If the roles were reversed, I might also share this
sentiment.



So an extremely accurate navigational system is available and paid for
completely by another nation. What's not to like about that?

There is one fundamental difference to other means
of IFR navigation: It is impossible to test and
approve the GPS signal. For the other NAVAIDs the
station can be measured on ground and fly the measuring
flights and compare the results with the specs in
ICAO Annex 10, and that's it.

Been there - done that.

--

Tauno Voipio
tauno voipio (at) iki fi