I would agree on thermal sensors, they are amazing and give very crispy images. Night or day, rain or shine, 1,000 yards + great technology.
In my agency we use them for surveillance...military grade. Detect at 5 km, recognize at 2 km, and ID at 1 km. Night, day, rain, shine.
These are uncooled. The cooled variety would double all those ranges...but 3X + on the price and not necessary for us.
I know they are adding laser to the MK-38, and would not be surprised if there was not radar control from their local surface, and maybe air radar...but not sure about it.