In almost a thousand dives, I have lost my mask once, and that was a careless back roll off a boat in Australia. I carry a spare mask in two circumstances: a dive where a direct ascent is not an option (overhead or deco) or surf entries.
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Sorry for the confusion here. I am looking for responses from people who consider themselves DIR and specifically if you carry a spare mask with you on a dive.
Some DIRs I have asked say yes, some say no and I was curious what factors might affect that decision and if carrying a backup was in keeping with DIR principals?