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Radar became so good during the War that I could swear I remember hearing somewhere that it was even picking up the snorkels of German U-Boats resulting in keeping them down.... after the "Happy Times" anyway.
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IIRC it's basically a matter of the wave length they operate in. If the wave is too large, they will fail to detect objects that are not at least as big as the wave (f.e. the exposed top of a periscope). At the end of the war radar technology was as perfected as to work in the 1cm wave, so it could detect very small objects if exposed enough time, like periscopes and snorkels
Anyway I don't care too much about sampans and such not being reported, I prefer to think that my radar crew identifies the signal as something very small and doesn't call me to the bridge for that.
What I would really like to see is a more recognizable different signal strength depending in size of the target.
