I am in Cat C. My ADF was belly up when I bought the plane and the unit
was beyone economical repair. I pulled it out. At the time I had a VFR
only GPS. I replaced it with a IFR approach certified GPS. A lot of
approaches still require ADF, even newly commissioned ones. Go figure.
So you need one or the other. There are a couple of approachs around
here that you can find the holding point over the OM and don't need an
ADF or GPS, but that is not the way the approach plate is shown.

Ross
KSWI.

John R. Copeland wrote:

"Julian Scarfe" wrote in message ...

Can anyone point me to data regarding the proportions of the US GA
IFR-capable fleet that have:

A Both an ADF and an approach-approved GPS
B An ADF but no approach-approved GPS
C An approach-approved GPS but no ADF
D Neither
?

Either piece of equipment counts only if it is serviceable.

Alternatively, would anyone like to take a guess at the %ages? This is
Usenet after all, and we shouldn't let facts cloud the issue. ;-)

Thanks

Julian



I don't really know, but I doubt there's any comprehensive data for that.
Be prepared for 'guesses' to be your only guidance.
FWIW, I'm in group A, because I saw no reason to remove my ADF
when I added my GPS, MFD, new transponder, and new radar.
I did remove my old LORAN and my old VOR/DME RNAV at the time.
I continue to find good utility in the ADF, and I'm glad I retained it.