Originally Posted by
ppilot
What is it about GPS? So many people will start chiming in with what they think is right, and they usually never are.
Any GPS is legal for IFR. You don't need any TSO standards. You don't need an approved installation. I can use any off the shelf GPS I want and file direct to anywhere I want using it. What rule says I can't?
I would be very careful making this type of statement when a FAA inspector comes. Read the GPS section of the AIM. You actually do need TSO standards and a handheld GPS is not legal for IFR operation only as a situational awarness tool. Going direct a fix during IFR operation using your handheld is not considered situational awarness.
What rule says that? Well here it is. AIM Page 1-1-28; d (1) (a).
"GPS navigation equipment used must be approved in accordance with the requirements specified in TSO C129, or equivalent, and ..."
"...hand held GPS are not authorized for IFR navigation, instrument approaches, or as a principal instrument flight reference. During IFR operations they may be considered only an aid to situational awareness."