Quote: (Originally Posted by
Alastair)

No and no.
As for helmet mounted lights they are useless for signalling - how do you do an OK, how do you keep the light forward to indicate to your buddy you are still behind them when you might want to look somewhere else, how do you create an emergency signal, etc etc.
Cheers
Al
Think of a Metallica fan underwater head banging to Enter Sandman for "out of air" and a stoned hippie for an "ok"
A