Just joined the forum. We are currently in a boat yard having all of our navigation, DC equipment and masts replaced due to a lightning strike. We are in the process of installing a TZT2 and ICOM M506, and having the same issues described by others. From what I have read on the forum, it appears as of March 2016 (version 2.05) the problem still hasn't been resolved. We're hopeful that Furuno will resolve this issue soon. Any ideas as to when? We are nearing the completion of all repairs and would like to avoid installing a IF-NMEA2K converter as another poster recommended, unless this is the only way to resolve the issue.