AOL? Dial up or broadband?
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The problem is that a diver will get used to checking the SPG at a regular interval and not changing the interval when they change their depth. This can become a real problem if they are diving their pressure rather than having and following a dive plan. Toss in forgetting to do it at all, or not seeing the pressure when looking at it because of Narcosis and they are well into an incident pit. It is a real revelation when or if you figure it out.
Bob
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I don't mean to Godwin this thread, but Hitler isn't AOW.
https://www.youtube.com/watch?v=YmqWSbJRrOI
(Sorry, I never get tired of that. )
The problem is that a diver will get used to checking the SPG at a regular interval and not changing the interval when they change their depth. This can become a real problem if they are diving their pressure rather than having and following a dive plan. Toss in forgetting to do it at all, or not seeing the pressure when looking at it because of Narcosis and they are well into an incident pit. It is a real revelation when or if you figure it out.
Bob
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It is my understanding that in the AOW deep dive, you go to about 100'. For the specialty, you go to 130'. In both cases, I think you'll use the card to see how light changes as you go deeper. Depending on your instructor, you may be doing some sort of a problem at depth to see the effect of narcosis on you in your AOW. I don't have the instructor requirements, so I am not sure if it must be done. It was for my deep diver specialty (I've had about a dozen different instructors over 2 agencies).
Hopefully and instructor can chime in. I'm just bringing this up as the OP talks about going to 120'.
Prince William is also the president of BSAC.And the Duchess of Cambridge IS AOW: Duchess of Cambridge gets scuba diving qualification - BBC News
I always assumed AOW max depth was 130', but I was incorrect it is 100, although the max recreational depth is 130. And just to set the record straight I have no plans to venture that deep at this time and if I do see a need I would seek additional training first.