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From a "big ship's" viewpoint, I'd always recommend an active radar device such as the Sea-Me, i.e. one that returns a signal when "interrogated" by a passing radar beam. Even a very good radar reflector isn't going to do much at 1.5m above the waterline. More often than not, those who say their reflector on the a-frame gives a good return miss the point that the return we get on the ship is actually from the a-frame, not the device!
A quick hint - always carry a roll of kitchen foil with you. If you break down, drift, or have to anchor near heavy traffic, roll it from one side of the a frame over the top to the other. By far the safest way of being found by a bridge radar.
Simon
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