DogDiver
Contributor
The best way is to keep it in your hand.
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Thread a cord through those holes (preferably bungee), fasten it with a knot, make a loop at the other end. Let the cam dangle off your wrist. Simple. Easily replaceable. Field serviceable. Hand-held cam is decently stable but be carefull with those fingers. It is quite easy to push them into picture...
Head mounted cam would be more stable, but I can guess you're not into diving helmets
The best way is to keep it in your hand.