I just purchased a 788ci HD DI and found a new update, v6.420 - adds NMEA2000 support. My question is since I had a problem when I uploaded an update into my 787ci2i and have to send it in for repair, is it worth uploading the update into the 788?
If you are getting accessories that require that connection, yes. If not-no big deal.
I didn't install it on my 1198c SI units.
You will get it later anyway when the next update is done and you install that.