Did the lazy Tower Controller give you as Traffic to the Dash? That was the crirtical thing missing in your explanation. If that had been done maybe the Dash wouldnt have gotten a fright. He would have gotten a command to climb with position of you as traffic on his TCAS with the distance and heights you quoted.
This is the major problem with a non radar environment and TCAS. Traffic has to be given by the controller, or you seek the traffic info yourself, or you broadcast your position. I operated in Jamaica for about 3 years, they had the same missgivngs with giving traffic information. If you are not satisfied, and you can see a problem or conflict immenant, broadcast your position to ATC or directly to the traffic concerned. Then its on the tape.
TCAS is very good tool. Used properly its a life saver. Has the Barbados Police considered intalling them in your choppers? I would serious think it a good idea especially military or police machines. Even a TCAD which has much less functions is very good.
I remmember the Owner of the NCB Bank in Jamaica had TCAS in his Global Express ( you expect) and his Augusta Chopper.
All I can say to your bosses, is embrace technology before it embraces you harder!
Sheep