aaronw wrote:
Don't the U.S. sectionals have frequencies printed right on them?

Well, I am looking at my Washington and New York sectionals.

Both of them seem to have little boxes saying 'Contact XXX approach
within 20nm on YYY'.

However, on a closer glance these appear to be *ONLY* for the class Cs
I can see at a glance - ACY, RIC, ORF, ISP, etc.

Yeah, and I think it's one of the dumb things about sectionals. Each
Class B has it's own terminal area chart, and that's where you'll find
the frequencies for NY TRACON. I wish they put them on the sectional
too, but they don't.

As someone else mentioned, though, there are indeed approach
frequencies given by radials from I assume the on-field VOR in the
side tab, which is of course seems to be always folded in the most
inaccessible place when I am in the cockpit.

The table that lists the frequencies will tell you how the sector
boundaries are defined. For New York, it's radials off the LaGuardia
VOR.