Aircraft systems are designed to rather wide standards,
measured in meters and not the centimeter accuracy of a
surveyor's system. An aviation GPS will lock on to all
visible satellites and begin giving navigation solutions
within just a few minutes. The aviation and
automotive-marine-hiker GPS include a navigation computer
and will to some degree do all the calculations and display
results. Your impression about aircraft accuracy is 100%
backwards.


You can find the specifications for GPS systems on the
Garmin or other makers web sites.


wrote in message
oups.com...
| Bob Noel wrote:
|
| [snip]
| Has anyone here used the type of equipment I'm
mentioning? You should
| see the time the thing I use takes to stabilize itself
to show the
| elevation... you'd comfortably CFIT if you had that in
your airplane
|
| yeah, but what is the accuracy of your GPS?
| I suspect it is much more accurate than needed for
aviation.
|
|
| Not really Bob. Most building, refinery and pipeline
surveys accept a
| +/- 0.8 centimeter variation, so it isn't pinpoint like in
aircraft, I
| think.
|
| Btw, just out of interest - does TCAS use GPS data in some
ways too?
|
| Ramapriya
|