...Air Traffic Controller or an AWOS.
All aircraft in a given area should be on the same altimeter setting so relative (altitude) separation is maintained.
A GPS, on the other hand...
...ATC surveillance systems. In all cases, while in controlled airspace each pilot operating an aircraft equipped with an operable ATC transponder maintained in accordance with 14 CFR sec...
...dian Reservation in the US.
Surface conditions of anything but a maintained runway carries additional ris...ot; pasture is 100 times rougher than the worst runway, and the worst maintained runway is 10 times smother th...
...nication is expressly stated as "private", for example Private Messages. In the case of private designated communication, member privacy will be maintained. In the event of legal action...