Umm.. then you've saved 50% given youve paid half of what you woulda had to. If you had saved 100% it woulda been free...
Well, then EAN is free for you. Or was the math a little confusing for you? Deep air can fry brain cells, be careful.
Yes, math is confusing for me actually. But then again, I take comfort in knowing it was so with Einstein too.
If I paid $1000 for air, but would have paid $2000 for EAN, did I save 100% or 50% of my cost?
If my current budget for air is $1000, but I want to purchase the same amount of EAN at twice the cost, I have to increase my budget by what %? Whatever that answer is is what I saved by using air.
Actual cost (AC) = 100% or 1/1 or 1
Potential cost (PC) = 200% of AC or 2/1 or 2
Savings of AC over PC? 2/1-1/1 or (2-1) = 1/1 or 1
1/1 or 1 = 100%
Now you may say that if something cost $2000 but you buy it for $1000 you are saving 50%, but that assumes $2000 is the whole or 1/1. In which case $1000 would be 1/2 or 50%. However, for me, air costs are the whole 1/1, so EAN is 2/1.
You can look at it as though you saved 50% of what you would have paid, or 100% of what you did pay. Either way, it appears the internet causes some divers to miss the main talking points and become mired in minutia.
Example (besides my nocturnal math ramblings): equating my occasional 130' and routine 100' dives to deep air. Awesome... I feel like such a bad ass now.
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I see these types of discussion from three POV's, usually all talking past each other.
On the one hand some people appear to advocate the use of appropriate mixes for appropriate depths, to off set the effects of narcosis (or to accelerate deco but that's another discussion). Sometimes their proscriptions seem a little arbitrary when viewed from a real world perspective.
On the other hand, some people advocate doing deep air dives despite the dangers of narcosis, claiming to be able to offset those risks via training or natural tolerances. Sometimes their methodology seems a little anecdotal and unnecessarily risky considering the alternatives.
On the other other hand, some people see the issue as being not so black and white. They recognize the risks of narcosis but also understand that arbitrary limits don't always fit. In real life they are comfortable operating somewhat in the grey. Often, this outlook only pisses the other two sides off because neither feels they are getting 100% (or 50% for some) agreement. If you are not my friend, you are my enemy.
It can either be a mudfest or an opportunity to talk about the issues at play and educate other divers (like Indydiver).