Frankly, I think radar isnt simulated at all in SH-4, or any naval sim for that matter.
Not even in games like 688i.
(I used to be a fisherman, and I always loved working with radar.)
There is so much more to radar then just a simple 'sweep' and a 'bleep'.
Al we get is a blank screen, apart from the radar sweep and the contact-blips.
But to answer your question, sea-clutter. That and the pitching and rolling of the ship. though of the two, sea clutter has the biggest impact. In real life you can decrease the gain to reduce the clutter, but less gain means less signal return, with the risk of small contacts not showing up on screen.
Now mind you, if you operate a radar at sea, you will ALWAYS have some sea clutter. But, obviously, the heavier the sea the more clutter you get. It's alway a trade of between gain and clutter.
Rain you dont have to worry about, a dont think they used a radar with a small enough wave length to pick up radar, or at least to pick up so much rain for it to become a problem.
But seeing as none of this is actually simulated in silent hunter I doubt anyone can mod the radar enough to get some weather effects.
P.s., can anyone do anything about the size of the contacts?
Right now even a small tramp freighter will show with an echo the size of a small island.
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