Do you keep old (1999 vintage) VHF radios on board when you replace it with one of the new AIS/GPS models?
AIS is not necessarily a VHF radio function. My Raymarine MFD can use a separate AIS module.
As far as a VHF radio function, I have enjoyed the DSC and MMSI functions. For a Real story for MMSI...
http://forums.sailboatowners.com/in...emergency-response-great.178787/#post-1291518
At least in my area, AIS has limited use. I am going to bet that AIS will soon be an APP on you iPhone, to link to your MFD.
When I bought my boat, it came installed with 2008 VHF noted in above link. Guess What?
The PO left his old VHF on the boat, tucked away.
Using a simple ≈$20 VHF antennae, I gave the vintage VHF (1998) to my son-in-law to use on his 40' power boat. He thought his iPhone was good enough. He didn't know he was not within USCG regs for off shore boating.
Jim...