Ron Garret wrote:
Just to interject a comment here. Use of a handheld to supplement other
instruments, or even to supplement radar vectors, under IFR flight
rules, is what I would call a gray area of FAA rules. On the one hand
it's not really expressly PROHIBITED. But it's not expressly permitted
either. The OFFICIAL word, because of liability and the FAA's history
of wanting things to be certified, is you can't do it.

Not so. The AIM specifically endorses the use of handheld GPS as an aid
to situational awareness.

rg

Which is different than a primary means of navigation.

Ron Lee