NRDK, you obviously don't understand the question either. There is a very good reason why we search crosswind in a big sea and that is because the target can be hidden in the troughs. The same is true of visual searching.
The advantage of the 350 radar is that you don't have to point where you are searching so you can fly your search box in almost any direction and still look effectively for the target.
Even in a moderate SS, searching downwind with radar is far better than into wind because the radar returns from the sea are reduced but again a 120 radar forces you to point where you are searching.
I won't even go into the advantages of having a dedicated Radop carrying out the radar search instead of the co pilot, especially at night or in IMC. I guess the DfT answer is such searches just won't get done or the asset will be launched knowing that the probability of detection is very low but launching makes the stats look good.