Being a pilot we are currently looking for a portable system to transmit flight details so that we show up on radar.
You may have seen aircraft tracking on websites like flightradar24.com
They work on 1090MHz and transmit various details like altitude, gps, speed, direction.
There are already standalone units on the market that are the size of a car stereo but they are no good for say someone that foot launches a paramotor as they are too heavy and bulky.
Perhaps something using a pi could be created???
Bit of a project for the clued up who want to work on something that is needed in the flying world.
http://www.nottinghampost.com/Tornado-f ... story.html
That is a link to a newspaper where the CAA want a small package for microlight aircraft to use.
Let me know your thoughts