Keith,
I have shot Snowshoe twice now. No one in my group of friends has seen a range official out on the range while shooting. Because the rules state that you cannot leave the range without notifying an official FIRST, I wondered just how I would do this (this year) if I had equipment failure.
So this year I inquired before going out to the range and the man at the sign in desk told me " yes, there will be an official out there" . Well, there wasn' t one. Which brings me to your issue of notification-
That should be done by a range official, and there should be at least one visible range official on each range.