I have optd not to use the helmet mount system for the GoPro while diving. The helmet is bad for travel space and its on top in front of the helmet. If it gets hit cracks the housing and it goes to GoPro heaven. My next option is the headstrap and pulling up a neoprene hood from around my neck up over the head band so it doesn’t come off and float away. My opinion of a GoPro attachment to the mask is not good. Enjoy your GoPro.