My Narco does that.

Paul

"Alan Bloom" wrote in message
s.com...

Have a Collins Nav/Com in my Skylane along with a King 155. Although
it doesn't have the "flip-flop" freg, the Collins radio works fine but
I really like a NAV feature not found on the King. You can switch it
to show a digital read-out of the "TO" or "FROM" radial. Very
convenient tracking complement to the OBS.