I just wanted to send a final update on this. I updated the Icom 506 to firmware 1.04 and the AIS started working on the TZT2, but no GPS or time data on radio. Today I upgraded the TZT2 to 3.01 and I am happy to say that all seems to be working perfectly now. I love some of the new features in 3.01 especially the teardrops to drag waypoints around when working out a course.
Eric