I still like the idea that it is a Wind Over Deck Indicator or Repeater. From a user's point of view, you would want to know that the ship was steaming into wind in a direction that was useable by the pilots. Thus the Island would have to be taken into account in any display as any wind in a direction that would take you into it would, by definition, be useless. Wind Over Deck is a relative measurement - so any instrument would require, at a minimum, ship's heading & speed as well as wind speed & direction. On a modern ship these might all be derived inertially but in WW2 you would need individual sensors for all four and then combine them through a summing circuit. The directional sensors would be 360 degrees but the combination as displayed would only be useful in sectors where aircraft could land or takeoff - hence the asymetric presentation.
Last edited by ICT_SLB; 28th Nov 2015 at 04:36.