GPS Approach Equipment Suffix

I posted this over at the IFR group but I had only one reply so I figured
I'd try here.

Question: Are folks with IFR Approach-certified GPS boxes supposed to file
/G or /R?

Before you answer consider that the AIM (and every other publication I could
find) define /G suffixes for Enroute and Terminal and it does not mention
"Approach." I've been filing /G with a Garmin GNS430 installation and I
initially scoffed at the notion when a pilot friend said I should be filing
/R. When he asked if I ever noticed that I've never been assigned a GPS or
RNAV approach when filing /G, I really couldn't remember if I have. Can
anyone else out there confirm being assigned a GPS approach when filing /G?

The other thing that's throwing a wrench into my logic is that the Preferred
Routes database on the FAA's website stipulates that some off-airways routes
can only be filed/cleared when filing "/E, /F, /G ONLY." I'm reluctant to
file the /R because I'd like to get cleared for one of these routes going to
Bangor, ME this weekend.

Apologies for the cross post.

Thanks,

Marco Leon



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