SD radar is air search
the way i figure it, patch 1.1 air search detects ships and planes
patch 1.2 SD detects nothing
there is a mod to fix some radar issues but the downside of using it, is that it lets air search radar detect boats too.
so SD radar either is useless. or overpowered..I dont know wich one to choose

im sick of planes hitting me out of nowhere because my air search radar wont pick them up under patch v1.2
but then i dont want to have enemy ships apear on radar, because i dont have that kind of radar fitted. on my 42 boat.