boogeywoogey:
Before I launch into my useless piece of advice, I do carry a mask in a mask bag on my left hip.
In anycase, I always hang on to my mask a second in the event of any close quarter contact or potential contact.
Rigt hand fist on second stage, fingers cover mask in face of wayward flipper or fin of other well meaning diver..
If above does not work, you are stupid for not covering yourself and you need your buddy SOON.
boogey
Sometimes your hands are full- one does not always have that option. You are either manipulating a mechanical object or possibly controlling another "diver".
And- unless you're wearing a Hydro-Optix (and even then) it is simply amazing what can 'sneak up on you' and bash your noggin. When I see it coming, I don't bother with my hand to the reg/mask, I just put my forearm up and brush the offending appendage gently away. Stop the problem
before it hits you vs. just bracing for the hit.
The best reason to lanyard your mask was discovered earlier in this thread. Personally- I have
never lost a mask while diving. Never even been kicked... all that hard, anyway.
The best reason? When you don't want the mask at the surface, you just yank it up and off and toss it over your shoulder. It will be waiting for you when you want it back.
No more stupid arguments or redundant threads on SCUBABoard deciding once and for all if the mask-on-the-forehead is a signal for distress or just trying to look like Mike Nelson.
If I am carrying a second mask, it is in a bag on my left shoulder. I find myself too often (in PSD applications and certainly when exiting the water) too often rolling onto my hip, but if it works for you on the hip during your specific application, great!
I carry - as a spare- a USD mask only available in Canada (not the US anyway) that is a extremely low volume nose pocket free dive mask with wrap around plastic lenses. Odd distortions but thinner than a Flounder! It's called a Sphera, see
http://www.aqua-scuba.com.au/products/sa.shr/dp_product_x/1/1/13/0/268
Once again, tailor your kit to be "mission specific". There is simply no reason, on
every dive of your career, to carry every piece of gear that you own. Some dives? A great idea to carry a pony tank, or safety sausage, or three computers... or even a
spare mask.
Other dives? You're just dragging out all of your SCUBA junk. Fit the kit to the dive at hand.
There are very few dives when a mask lanyard would be a detriment.