Join Date: Jul 2000
Location: Atlantic Highlands, NJ
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Older Class A don't see class B
Unless, for all the reasons given previously, a Class A vessel decides to ignore Class B signals; your class B info will be seen on a Class A vessel.
It may be that the Class A vessel you tested your unit with was running early software on their device. I understand this may happen because early Class A was designed before the Class B protocols were envisioned or finalized. There is probably an update available for the suspect class A unit, but it has not been applied. I've also heard from people that the Class A vessel can see them but their vessel info is not showing up on the Class a vessel screen, just the blip is there. Again, a related software incompatibility issue. If other Class B vessels can see you then try contacting another Class A vessel sometime and they will probably respond that "I see you now".
Another pretty typical problem with new Class B installations is a bad antenna or shorted connector on the VHF side. Same as with your VHF radio; you may still get very strong signals, but you can't transmit.
Hope this helps.