I know the Garmin 530W will lead you through a published hold, such as on
the missed approach, but is there any way to get it to lead you through an
ad hoc en-route hold, like when ATC tells you to hold at a certain VOR?

It looks like if I hit the OBS button it will stop sequencing, but what
can I do then?

--
Paul Tomblin http://blog.xcski.com/
FAQs are like flatulence. Any asshole can produce them.
-- Toni L