It probably depends on what you are trying to achieve,
together with the capabilities of your helmet Bluetooth device,
as there are different connection options.
I have no knowledge of the Autocom system.
The Trophy has a dedicated "NAV" Input plug ( 3.5mm stereo Jack Plug )
which can be found behind and below the left mirror pod, usually taped up
and with a black protective shroud over the plug, coming off the main harness.
In the same are there is a dedicated "clean" Power supply socket - also blanked off,
for which you can buy the corresponding multi plug ( 2 pin ) accessory cable
for providing power to the Garmin.
This is a useful Topic on fitting the Garmin Bracket :
HOW TO: Fitting Triumph Sat Nav Mount & Zumo 660The way the NAV Input works ( NAV AUDIO has to be switched ON in the Trophy Menu ),
is to mute all other Audio Output fromthe Trophy Audio Unit
( Radio / iPod on USB connection etc ) so that the SAT NAV voice instructions can be heard.
Audio Output from the Trophy can be selected as either HEADSETS ( for Bluetooth Helmet )
or SPEAKERS ( for the Trophy built in Loudspeakers ).
There is NO wired Audio Output fromthe Trophy, which I seem to remember from a past Post
that you might need for the Autocom system, but I also recall someone tapping into the
Loudspeaker wires for this connection.
The Bluetooth Output of the Trophy has 2 Channels ( numbered 1 & 2 ).
Channel 1 is "HEADSET 1" ad Channel 2 is "DEVICE 2" in the Trophy Menu.
( Note the numbers are the Channels, there is no HEADSET 2 or DEVICE 1 ).
HEADSET 1, as the name suggests, supports connection of a compatible Bluetooth Headset,
while DEVICE 2 supports connection of a compatible Bluetooth Headset, or Mobile Phone,
or Audio Streaming device.
I will see if I can find more information on the Autocom and will let you know if I do,
meanwhile I hope the above will be useful in planning your configuration.
Cheers

