John,

120.6 is the approach frequency for BOS south. It's on the Low Altitude
Enroute chart, the approch charts, and the AFD. Are you thinking of a center
frequency?

- Steve

"John R" wrote in message ...
The low altitude frequency for BOS approach south of either BOS
R270 or near Interstate 90 is charted as 124.1 Mhz. Maybe that
is the frequency that they use at 3 AM on a Sunday morning, but
I've always been asked to use 120.6, both on initial call ups or
handoffs from another sector. This frequency isn't charted. Why
don't they chart 120.6 since it is the commonly used frequency?