The radar and sonar combination mirrored that in Sea King HAS 1 and 2 aircraft. However, it was better in the Wessex 3 as the blinds actually kept the light out so you could actually see the radar screen properly. The radar itself was a fresnel lense system with true motion capability delivered by the Blue Orchid doppler nav system. The interface between the radar and sonar was a bearing and range strobe controlled by an in contact switch on the sonar linked to the sonar sector display target indicator. All very agricultural however it worked and could be made to work well.