The GNC255A is a good quality, rack mount 10W, dual watch, multi voltage, Nav Com transceiver.
A great replacement for your old Nav Comm unit.
The Comm function of the GNC255A contains a quality receiver with very good noise filtering capability, and a transmitter with 10W output.
It has a good quality 2 place intercom
The Nav side has a VOR/LOC receiver and unlike most othe manufacturers it has an integrated GS (Glideslope) receiver.
For more information Click Here to access the Garmin website GNC255A page.