I've never used one of these, but the idea is interesting:

http://www.speedseal.com/seame/welcome.htm

.... it apparently works along the same lines as a SART, enhancing your
radar "blip" by using an active transponder.

Two other points I'd add:

We used the "el cheapo" Davis reflectors on drift buoys on the research
ships I've been on. With the reflector, the buoys were usually visible
on radar at 10-12 nm out, without the reflector they were almost
entirely invisible to the radar no matter how close we were. Not very
scientific, but pretty good evidence that they work IMHO.

No matter how "good" your radar reflector, it by no means replaces your
need to stand an alert and vigilent watch.

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