Why no redundancy in mainstream rec scuba?

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to deviate from the Law of Thirds.
The rule of thirds is a useful planning tool for dives of certain characteristics. For other dives, it is the wrong tool for the dive. For most recreational dives, it is the wrong choice.

Spare mask: the only reason I carry one is because people have broken mine before getting into the water by falling into me or while I am helping them gear up. The majority of the time I end up giving my spare mask to someone who doesn’t have a spare mask strap.
I said I do not carry a spare mask while I dive. I don't. I do, however, have one with me at all dive sites. I once sat on one, and it did not fare well. I am pretty sure I won't sit on it during a dive.
 
Rec, Tec, Cave, Wreck-whatever you call yourself these days , dive with the equipment you
feel necessary for the dive at hand.

No diver should criticize another diver for their choice of equipment, particularly on a boat where
divers are confined, and partners, for awhile.

"You have too much stuff", "You do not have enough"-all foolish comments.

I am a minimalist. I dive only with the gear I feel appropriate for the dive at hand.

I mostly dive solo. Easy to do off California boats.
 
Your buddy is your redundancy.

I moved this over to the nice theory, but not always useful, category on my very first dive as an OW. Met a guy at the local quarry. Viz turned out to be a few inches. New buddy had no interest in being available. Disappeared almost immediately. More than once.
 
I have never lost a mask on a dive (my daughter did throw one at a seagull she thought was choking on a sock).

There was a guy on the boat, we all just got out of the water and were taking off gear, he took off his mask and tossed it in the mask bucket in the corner, 4 maybe 5 feet away. The boat rocked with perfect timing and mask went over the bucket and overboard. It was a perfect drop shot.
 
Rec, Tec, Cave, Wreck-whatever you call yourself these days , dive with the equipment you
feel necessary for the dive at hand.

No diver should criticize another diver for their choice of equipment, particularly on a boat where
divers are confined, and partners, for awhile.

"You have too much stuff", "You do not have enough"-all foolish comments.

I am a minimalist. I dive only with the gear I feel appropriate for the dive at hand.

I mostly dive solo. Easy to do off California boats.

I agree. Think it through then own it. What you do is what you do. When you venture into telling others what to do, then be judicious. There's always the guy with a sideways comment about another's rig, gas choice, exposure protection, etc.. Unless it's life threatening, once you're on the boat, I've learned to keep my mouth shut unless asked. I figure worst case, they have a tank on their back, they'll figure it out. Dived with a guy today in Coz wearing a 7mm and 40 lbs. of lead. The DM knew it as they were in discussion. They figured it out. :)
 
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I'm a new diver and come from an aviation safety background. I can't
help but view the sport (rightly or wrongly) through a similar lens.

No plans to dive beyond rec limits or to deviate from the Law of Thirds.

I don't want the whole dive store hanging off me but the idea of a redundant air source appeals to me for all the obvious reasons.

how do you apply the "rule of thirds" to recreational diving?
Rock Bottom is much more appropriate for open water diving than the rule of thirds which is for penetration dives....
 
My normal setup addons.
DSMB and reel
1 x knifes
1 x torch (little just to shine in gaps)

Wreck dive addons
DSMB and reel
Finger spool
Primary torch (2800lumen)
1 x back up torch
2 x knife
Wetnotes
Compass

Deep addons.
Pony
DSMB and reel
Primary torch
Backup torch
1x knife
Dive slate with compass attached.

Me and my wife dive as a tight buddy pair. Depending on who is leading the dive we are within arm length at all times
 
There was a guy on the boat, we all just got out of the water and were taking off gear, he took off his mask and tossed it in the mask bucket in the corner, 4 maybe 5 feet away. The boat rocked with perfect timing and mask went over the bucket and overboard. It was a perfect drop shot.
Ha. he did TWO things wrong. #2 was what you described. #1 was the intention to put his mask in the communal mask bucket, from which ones gets sinus infections, pinkeye, whatever is going around. So, by throwing his mask overboard, he may have stayed healthy!
 
I said I do not carry a spare mask while I dive. I don't. I do, however, have one with me at all dive sites. I once sat on one, and it did not fare well. I am pretty sure I won't sit on it during a dive.
I used to carry a spare prescription mask, but broke it when the current smashed me into a log while exiting from a high-flow cave. Thank heavens I had a redundant mask already on my face!
 
I said I do not carry a spare mask while I dive. I don't. I do, however, have one with me at all dive sites. I once sat on one, and it did not fare well. I am pretty sure I won't sit on it during a dive.

Now that I live in the cold country and dive with a drysuit I carry a mask in my pocket. Easy place to keep it. Plus I conduct PSD work, so carrying one and deploying it once in a while on recreational dives helps keep me in tune just in case my FFM has to be removed.

When I lived in the Caribbean one of my students swam over my head and pulled off my mask by mistakenly hooking my snorkel. I had to swim down and find my mask on the reef. After that I decided a snorkel will remain in the bag on the boat or on shore. During tech training we were required to have one. When diving in the tropics I don't carry a spare mask with me on the dive.
 

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