Lee, it would be far more in the spirit of Rotorheads to post here rather than resort to PMs to ask for generalities or even specifics.
FWIW, the Wx HAS3 back room was almost identical to the Sea King HAS1, so apart from hover/jump heights and a far better compass display with Rtheta for the driver in the HAS3 there should be little difference, especially in the 195 feed to the Doppler plot.