In trying to work thru/with various folks on why the current installed crop of Class A AIS transponders can't seem to see the full information that our class B unit is transmitting we came across this tidbit. http://www.ndgps.go.kr/?act=skyboard.act <http://www.ndgps.go.kr/?act=skyboard.act&ch=foreign&code=foreign&from=341&m ode=DOWN&no=338&page=6> &ch=foreign&code=foreign&from=341&mode=DOWN&no=338&page=6 It seems that the IALA specs haven't been updated or in some cases even published that bring them up-to-date with the emergence of the Class B units among other glaring deficiencies. It even appears that the AIS group hasn't yet found where it sits in the hierarchy of the enav system that the IALA has mandated. I don't know exactly what this means but trying to get a copy of the AIS spec that seems to have been done in 2006 as edition 3 vs. the commonly available edition 1.3 from 2004 doesn't seem possible for this layperson..perhaps others out there have better sources...if so I'd sure like to share them :-) In the meantime we still appear as a mere "shadow" to most Class A transponders. It appears that it is a software issue in the display software vs. a firmware issue in the transponder itself.again this is a bit of conjecture on my part but looks pretty valid at the moment. Sooooo, my advice for the moment is to hold off on the purchase of one till the issues have been resolved. Just because they finally pass the FCC wouldn't mean they can be heard! As always YMMV.. Dave & Nancy Swan Song Roughwater 58 Caribbean Cruise '07 787 990-6064 Sat 954 252-3830 fax