Dave,
Most of the radar manufacturers have data simulators,the dealers use
them in the showrooms to demo display units..... You might contact
Kongsberg/Simrad or Raytheon High Seas, or Foruno , they may be able
to refer you to a dealer near you, I've found Foruno and Simrad to be
easier to work with What kind of system do you have? Does it receive
AIS or just accept data from an AIS system? Just curious!

mark victor