Aqualung i300c Average Depth Calculation Issues?

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NDL is my limiting factor.
What happens if you are at a shalliowish site, like 20 ft, which is what Blue Heron Bridge is. Do you still use NDL to plan your dive?
 
Plan a dive for 20 ft ? Can I use a slide rule?
OK: I'll just figure on a two hour safety stop.
 
Plan a dive for 20 ft ? Can I use a slide rule?
OK: I'll just figure on a two hour safety stop.
I can't tell if you are joking or simply do understand that NDL is not the limiting factor for shallower dives.
 
I'm saying for a 20 foot dive I'm gonna come up when I'm bored, cold, or have run out of air. I don't think that calculated SAC will be much help in "planning" a 20 foot dive. Do you?
It must be a complete miracle that I've survived 46 years of diving not worrying about average depth or SAC. To me SAC is best used as a tool to help new divers feel bad and intermediate divers to feel good.
If you would, what would be your dive plan for a 20 foot dive using your SAC?
 
Bottom line is, how can I trust that this computer calculates properly the tissue loading and all the other values if the average depth is not calculated properly? I emailed Aqualung and did not get an answer.
 
I don't think that calculated SAC will be much help in "planning" a 20 foot dive. Do you?
Not just Yes, but how else could I plan the dive?
If you would, what would be your dive plan for a 20 foot dive using your SAC?
Let me give an example:
Let's say Blue Heron Bridge -- arguably one o the best shore dives in the US -- is a 20-ft dive.
You can only dive it at High Tide plus and minus one hour, or else the current is too strong, and the closer you are to HT the more comfortable the dive and the viz are.
If you are using an AL80, when should you go in the water so as to optimize your dive time? 60 mins before HT (thus a 2h dive)? 30 mins (a 1h dive)? 15 mins (a 30min dive)?
The issue is how fast do you use up your gas at 20 ft?
NDL is irrelevant.
I know when I need to go in the water.....when would YOU go in the water?
 
Obviously NDL is irrelevant at 20 ft. But, what IS your dive time based on your SAC at 20 ft? That's what we're talking about.
Bottom line is, how can I trust that this computer calculates properly the tissue loading and all the other values if the average depth is not calculated properly? I emailed Aqualung and did not get an answer.
 
Obviously NDL is irrelevant at 20 ft. But, what IS your dive time based on your SAC at 20 ft? That's what we're talking about.
I KNOW my SAC, so it is easy to calculate my dive time at 20 ft. (2h, by the way)
But apparently you do not know YOUR SAC, so you have no way to calculate your dive time. Right? You said earlier you just dive 'til you run out of air. Not much of a "plan" for someone with as much experience as you claim.
 
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