There is a flyspray for this, FS#1557. If you go to that in the tracker you will find a version of OCPN that allows you to change the talker id. The change is currently waiting for the change freeze to end so that it can be incorporated into the next beta.
Originally Posted by wrlundgren
has anybody an idea how to change the talker id in openCPN
Default is "EC" but I need "II" ( Integrated instrumentation ) for my older Furuno Autopilot