If you ever get a chance to tour a 911 dispatch center, do it, it explains this a whole lot better when you can see it in action. When you call 911, your phone sends a location just nanoseconds before you get the ring sound. The 911 call travels to one of the national routing centers which in turn sends it to your local 911 center. This is done with all calls regardless if its a cell or landline call. It also takes nanoseconds to route the call properly. The cell phone does not track and show anyone a direction of the caller, it only shows its location one time as the call is initiated. For someone to be tracked, the caller would have to hang up and redial several times. Each call would show a location plotted on a map which also gives the 911 center the nearest fire, police, EMS stations. Now, if you call from your tractor in the middle of a field, you will be expected to know the approximate crossroads of the field entrance. The 911 call will plot on a map, but can show a general location due to not having an actual road to reference to. Your field entrance may be on another road in another township. You will learn that injured people are generally disoriented from shock and sometimes go unconcious during the call. Also, IF your phone is not GPS enabled, it will show a large circle around the cell tower that the call came from. This circle is a 6 mile radius and the call can originate from any location within the circle. This is the reason that the new phones are coming with GPS. Makes finding injured people a whole lot easier. Old activated phones work calling 911, they will not allow a 911 dispatcher to call you back, and your location may not show on the call screen. Trivia - Did you know that 911 lines are assigned a regular local phone number which can not dial out? If your community has 20 incoming lines, they are all numbered different and usually not in sequence. Dispatchers must use a regular outside line to call back disconnected calls.
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