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I think this thread and this information is very useful and the above sites worth reading/visitingAiming mirror at specific person/target can be done by holding arm out and making "V" with fingers bracketing target and flashing fingers with mirror (thanks Walter)
EVERYONE ... you need to save this, a very good, if long, read on rescue trials in real world conditions, conducted in the Scapa Flow ... How far can you see me? ... Diver location trials, Scapa Flow Charters : Introduction
And this .. Equipped to Survive ... EQUIPPED TO SURVIVE (tm) - SIGNALING GROUP
... and the rest of the website is a treasure trove of useful info ... Survival Gear and Equipment Evaluations - EQUIPPED TO SURVIVE (tm) ((so you think a CD would make a good cheap mirror? .. nope, barely 25% as effective as a small plastic mirror))
And one more, an interesting new product at DEMA ... Quality Diving Equipment by Custom Divers - SEEKER - RADAR DETECTABLE SMB
Quality Diving Equipment by Custom Divers - SEEKER - RADAR DETECTABLE SMB