I think you'll want a microcontroller as well to limit the amount of data sent out. On many GPSs, you can send a position request and get a response back like this:
at+cgpsinf=44,4222.033483,N,10031.739679,W,040711.000,A,AOK
You'd want to 'parse' that and just send the position part of it back, and maybe then not even all of it.
I don't know about this:
"Or even something simpler as the rf gets stronger make something keep r faster maybe? "
That'd be on the receiver side, not the aircraft/transmitter side. Determining the signal strength would be needed. If you have the transmitter's location tho, you can equip your receiver with GPS as well, and then having the two locations you can determine a direction to head in to go to the aircraft.
Non-WAAS GPS receivers can send out a position that can be up to 2-3 meters off, that's just the limits of GPS and triangulating from signals high above the Earth:
GPS satellites fly in medium Earth orbit (MEO) at an altitude of approximately 20,200 km (12,550 miles).