Dave Touretzky wrote:

Having had a chance to think carefully about what the Garmin is
displaying on each line, it does make sense. But it wasn't at all
intuitive when I first saw this screen in the air, and the manual's
skimpy coverage of DME arcs did not prepare me to decode this sequence
"on the fly".

Then again, a DME ARC is not an RNAV procedure. If the Garmin engineers' view
of how to approximate an ARC results in bad human-factors, the pilot is
ultimately respnsible for remaining in protected airspace. Sometimes, it is
simply easier and safer to do the ARC the "old fashion" way.