I was never actually trained on EDD. Some of us just heard a rumor that the system was and running when we still had DIAD III. When we inquired about it the center manager told how to use the IR transmitter to receive EDD,, but also warned us that it may not bee 100% since it was still in development. I gave it a try and loved it from day 1. The bad thing that came out of it was I became one of the go to guys in my center when other drivers had questions. A lot of the guys know that I am a bit of a tech geek anyway and know some of the ins and out of the DIAD so I usually get cornered about DIAD questions anyhow.