With each scout sent to scout somewhere, when you go back in to send a second, third, fourth scout the map you select the hexs on gets increasing whiter as another layer is added to it I think.
When I tried to send my 5th scout I could barely see any of the hexes and just could make out the keep names (barely).
When I tried to send my 5th scout I could barely see any of the hexes and just could make out the keep names (barely).