The future can be here now: electronic
instrument displays in your homebuilt.

Glass Cockpit: Part II by Paul Lamar
Kitplanes
January 1989 page 66
Automatic position reporting could be helpful
when pilot's hands and mind are full.

Paul Lamar


Some ham radio operators use APRS.
  Automatic Position Reporting System.
  That tells someone else where you are.
  Receive your own signal and now you
  know where you are, Virg