But what is the integrity required of ADS-B equipment, particularly the most compact and least expensive? If your equipment fails and no extended squitter is being transmitted, the entire system is suddenly blind to your presence. Or, what if the system broadcasts an erroneous position and velocity? You can imagine the risks that would create. Of course, our present day transponders can quit working, or send a wrong code or altitude, but the primary radar should still see our basic position. We're also talking to controllers and reporting our altitude initially, and agreeing on our approximate position. With ADS-B, remember, the "A" is for automatic, so there needs to be a high level of integrity monitoring built in so pilots and controllers could be warned of unreliable data.