Thank you guys, this is very interesting. Until the other day I knew nothing about these radios, and now that I have been reading these boards, I'm finding they are quite a bit more complicated than I ever imagined. However, I am surprised that the emergency button only transmits a radio ID. Then ...

It is my understanding that when the orange button on top of an MTS2000 is programmed to be the emergency button, when pressed, dispatch(sys controller) will immediately know you are in trouble......but how do they know where you are? Or is the function based on the idea that they already know about ...