In article ,
Alan Gerber wrote:

john smith wrote:
The NAV function is of use when you have to talk to FSS on a COM
frequency and listen on a NAV.

Is that capability built in, or do you have to switch frequencies every
time you switch between transmitting and receiving?

Built into the ICOM's.
The original A-2 had the same processor programming as the ham 2m IC-2AT.
Using the 2AT instructions on programming the repeater duplex offset,
one could program the air band to perform the same function (tune NAV to
listen/receive, depress PTT button and the frequencey would change to
the COM frequency to transmit.