Go about an inch forward from the top of your helmet. This is some footage of the camera like this. Keep in mind that my helmet has a fairly big visor. And you can adjust the mount with the attachment piece.
i got a helmet with a brim, i mounted my cam just where the brim begins, so on the top of my forehead and i've never had any part of the helmet or brim visible in my vids...
its only visible when i tilt the cam ridiculously downward
the way i approached it; i just put on my helmet and held the cam with the mount pressed against the place i tought was good; then walked around the house while filming; then analized the footage and decided it should be more forward or backward, until i had the perfect spot....
"The joy i get from skiing; that's worth dying for !"
-CR Johnson, RIP
my friend has my camera so I cant take a picture for a few days but what I do is put the cam on the helmet and hold it beside my head and just eyeball it. I suggest playing around with it to see what angle you like best.
"the things i would do to that girl" - Jeff Schmuck