I can think of one very good use for it... We used to play a game when it was quiet in TC. Set up the whole UK coastline on the videomap and offset to anywhere along it. Now change the range to about 5nm so you have just a short stretch of coast showing. Game is to get your "opponent" to say where it is. If he now only has to put the rolling ball on it for the lat-long to show that would definitely be cheating!