I am trying to find a solution for broadcasting wireless data to a display screen small enough to fit into a wrist watch. The broadcast will only need to cover an area of 200 yards. I need to be able to input information within the control panel/application and then broadcast the data to the watches. I have looked into internet watches (timex, fossil, etc.) yet in third world countries internet connectivity will become an issue. A self contained system would be ideal.

My research has not uncovered a technical starting point.

Thank you for any help in advance.