I'd add: If you are also capturing intercom audio, make sure you have a plan to deal with noise. I'm still
struggling to get my Garmin VIRB to accept both DC power and audio through the same connector. I didn't expect the amount of noise generated by putting both through a single USB connection.
It sounds like the VIRB is similar to my GoPro. However, the GoPro wasn't really designed for external power, nor wired audio. I had to buy a replacement battery door that had a hole in it so that a USB-C cable could be plugged into it with the door closed. Additionally, I needed to buy
this dongle to get a 3.5mm jack on the GoPro. Then I needed a LEMO-to-3.5mm (or in your case, likely a headset-to-3.5mm wire) so I could get the audio output out of my headset and to the GoPro's dongle. The Y adapter basically passes audio ground and headset L&R (with a 47kohm resistor inline with the Left & Right) to the 3.5mm jack.
btw, I did try an older VIRB connected to the GMA245 audio panel via Bluetooth.. but the audio quality was not great (admittedly, it had no noise though because it was a digital/wireless connection). Its a shame Garmin discontinued the VIRB line.
All that said, the audio was HORRIBLE. The reason is that internally, the GoPro has one ground bus.. so its power ground (USB) is tied to the audio ground. And now, electrons have an additional way to get to ground..and the GoPro sits inline with that path. great if you want lots of noise.
My problem was solved with a
$10 isolation transformer. Technically it does muffle the audio a little, but you'd only notice if you were examining the signal on a scope.. its a non-factor.. the important thing is ALL the noise is gone. The transformer converts the audio signal from the plane to a magnetic signal... which is then picked up by the other side of the transformer and continues on to the GoPro.. no electrical connection exists between the plane and Gopro along the audio cable now.. so no more ground loop.
Here's an
audio file with a before and after clip