"Robert M. Gary" wrote

Ok, so if you come in and want to rent a C-172 but have never flown
with a 430 should I require you to do a 5 hour training course?

Apples vs. oranges, to me, with that comparison.

A fancy GPS is not necessary to fly VFR in _any_ airspace, while a
transponder is. (in some airspace)

I have to agree that a 5 minute, or even 10 minutes (if it takes that long)
lesson on the transponder should be included in a checkout.
--
Jim in NC