re:- Are there free alternatives for OpenCPN
Yes, but for me O is outstanding also compared to commercial
re: - What is the chance for an update of OpenCPN with support of AIS
version 2 in the nearby future?
The change is very good. If discussions here come to same opinion I wrote in last post, did-g, Dave or anyone (like me) can edit the code and make a request to change in next release. The "official" way is that for example you make a future request in the Tracker/Flyspray. (See third thread in this forum)
Welcome to the world of OCPN and this forum where all kind of generous people met.