|Quoting Qxeguy (Reply 4):|
OK. Let me clarify my question. Can you LEGALLY go GPS direct under IFR from Airport A to Airport B where no defined airway exists with a Panel mounted VFR only GPS unit? If so, where does it say that you can do that?
In a word, no. Furthermore, if you use an IFR-certified GPS as your primary source of enroute navigation in IFR flight, you still need to use another source to back up the GPS (VORs, NDBs, LORAN, RNAV, INS, etc.). However, you can use it for non-navigational purposes only; in other words, it can't be used as a source of naviagation information. Nothing says you can't have it turned on with the route programmed in - I would argue that even though it isn't IFR-certified, the GPS in question can still prove to be quite useful.
Now having said all that, here in Canada, there exist non-precision approaches for which GPS is the only practical means of completing them (RNAV (GPS) approaches). There is no easy way to back these approaches up, due to the unique construction of the approach.