Even if the handhelds would have the same features as certified ifr gps and even if they would comply with TSO (which is highly unlikely), there are still some unanswered questions:
- How do you interface them to the autopilot? (and other avionics)
- How do you integrate a handheld gps into your instrument scan?
- How long can you afford to play with a handheld between your knees in IMC and turbulence before your attitude goes to pieces?
- Would you like to be passenger in a airplane in solid rocking IMC where the single pilot relies on a device that stops working when a loose cable becomes unplugged (antenna for instance)?
