Quote Originally Posted by Auburntsts View Post
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The problem is an IFR GPS has to meet the applicable TSOs (eg TSO non-WAAS c129 and WAAS c145) unlike the flight instruments you mentioned as non-TSO'd examples. Showing TSO compliance requires testing and equipment beyond the reach of most. So I don't see the FAA ever buying off on an "experimental" IFR GPS. Just my $.02 but I'm not an avionics expert by any stretch.

So, thats precisely the question. What is the process, if any.
I think at that point it might be possible to size the effort. Note, the receiver per se, in otherwords the hardware, is already TSO'ed.

I'm hoping some folks who have worked on non-TSO'ed avionics might have some info.

To save some time, I've already looked at the applicable advisory circular, TSO C149, 161b and 162b, 192 etc.

They don't say anything specific other than "meets DO-178B" which is also pretty non-specific.

Is the only way to do IFR GPS to be garmin?