drrich2
Contributor
Camera records what I see. Computer records the dive profile - depths, average depth, etc... I'm an air hog, so air remaining (PSI), not NDL, is my limiting factor, and either way, the computer (AI) can tell me about it. I mainly shore dive Bonaire with AL80's or follow dive guards on charter boat dives (e.g. Cozumel, Grand Cayman, etc...) so I'm not keeping up with way points - a Bonaire dive plan might be swim out to drop off, head north at around 30 - 40 feet (going deeper momentarily if I see something interesting), turn around at about 1800 PSI, amble back around 20 - 30 feet deep, do safety stop on the way, pop my head out of the water & see which way to head back in, drop down a bit, swim back, tool around in the shallows till the PSI gets to around 400 - 500, then walk out (assuming warm, tropical water with excellent viz. & minimal current where exit is pretty easy).
There is no 'alternate plan.'
Now, if I were planning a dive of the Oriskany (which I've never dove), was diving a 130 HP steel tank with 28% nitrox, and knew the advanced depths I'd be down at, that could be different. I might break out the air consumption rate formula from the SDI Solo manual, calculate out my estimated air consumption rate at the depths I'd be at, consider NDL time limits on the nitrox mix, and would be looking for specific landmarks on the wreck since there'd be a specific agenda.
Compare to a shallow to moderate Bonaire reef dive were the plan is 'swim at 30 - 40 feet unless you see something pretty, don't get over 110 feet on your EAN 32, come up slow, do your safety stop & watch your SPG/computer closely.'
Haven't needed a slate for underwater use on Bonaire.
Richard.
There is no 'alternate plan.'
Now, if I were planning a dive of the Oriskany (which I've never dove), was diving a 130 HP steel tank with 28% nitrox, and knew the advanced depths I'd be down at, that could be different. I might break out the air consumption rate formula from the SDI Solo manual, calculate out my estimated air consumption rate at the depths I'd be at, consider NDL time limits on the nitrox mix, and would be looking for specific landmarks on the wreck since there'd be a specific agenda.
Compare to a shallow to moderate Bonaire reef dive were the plan is 'swim at 30 - 40 feet unless you see something pretty, don't get over 110 feet on your EAN 32, come up slow, do your safety stop & watch your SPG/computer closely.'
Haven't needed a slate for underwater use on Bonaire.
Richard.