In article . com,
"John Galban" wrote:

I just retired my old KX-99 handheld and bought an Icom A-6. The
A-24 version has the nav channels. Since I've never been impressed
with any handheld's nav capabilities, I opted to skip that feature
altogether and go with the A-6.

The advantage of having the NAV frequencies is that you can duplex with
AFSS over a VOR. The radio can be set to listen on the VOR frequency and
transmit on the COM frequency when the PTT is depressed.
The NAV function does not work well because of the antenna polarization.
NAV frequencies are horizontal, COM frequencies are vertical.