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Waterproof USA - Are all modifications and repairs still done by DRIS? The question relates to a purchase decision... Spence

A BF Knife. Grew up waiting for the next episode of Sea Hunt. Couldn't wait to see Lloyd Bridges get into an U/W knife fight - almost every week. Started diving in kelp and couldn't afford a big knife. When I finally could afford one, bought a cool big stainless blunt tip knife. Spent a...

I'd heard of research getting to human trials prior to the Abyss - probably inspired incorporating it into the movie. But always wondered - how did they prevent secondary drowning after removing the fluid? the natural lung surfactant coating must be broken down and removed by the fluid. That...

There are known reliability issues with a monitor for CO2 scrubber breakthrough. I'm aware of some. Can anyone identify others? 1. Sensor performance in high humidity - 2. Precision/Sensitivity - a sensor needs to detect an increase from about 300 ppmv to 500 ppmv to be effective at...

And with what valve is this tank equipped?

Donnad, I've only used Prescription Dive Mask in San Diego - twice now. They have been very helpful and informative. My masks both still function well, the older Rx mask is my backup...

If light penetrating water becomes completely vertically polarized, then you would have total blackout if you tilted your mask side-ways underwater. While that might be cool to see, I wouldn't want a mask doing that.

Of the attachment options mentioned, good that no one has suggested tying off to the "scooter" D-ring. About 8 days ago, a friend hooked his new "monster-sized" wreck reel to his front and center ring. Even in a compressed-neoprene drysuit he had a brutal giant stride off of the boat. He...

I've not dived near Singapore, but was sailing in the same area mentioned in the article. I would call the current very strong. I didn't measure it, but figure I've seen 3 knot currents in the channel between Pulau Ubin and Chengi. That can take you out of visible contact in four or...

Ive been meaning to make a DIY bungee version myself. My Aussie made wrap strap is good, but I don't like how long it takes to get it secure on my suit. The Giffman version looks good, and you would have to pull both pins loose before you would loose the watch. But I'm concerned that a tug on...

Probably get less than a pound. (When I washed the hood, it stayed submerged in fresh water with a 1 lb weight on it). I think the five lbs came more from the subjective things - and maybe because the volume premise might be flawed. Could a new trilaminate suit require more weight because...

Dave C - that is simple and it appears sensible. I just tested my first drysuit out yesterday. I estimated weight by listening to a couple people's own "rules of thumb" - then confused at the difference, I just averaged together the result from each of these "rules" Not surprising...

I had to think about that formula. Watch that you don't interpret the fg/pt as division! PG = FG*PT, so PG ______ FG * PT Example: PG = FG * PT = 0.32 * 2 atm = 0.64 atm and FG = PG/PT = 0.64 atm / 2 atm note: depth about 33 feet = 0.32 fraction...

Good suggestion. If this becomes a good discussion, I could see it being a whole forum. I've found the physics and physiology not too challenging. And probably much brighter people than I am may find it difficult. My work has me doing alot of calculations and often exploring new ways to...

Drat, I bought the crew pack with the encyclopedia, DM manual, a whole bunch of stuff, but no Instructor Manual and no exams. I've since purchased the Instructor Manual - basically had to for the internship portions. I think I had better not study from the standard exams. There are not...

I'm getting organized for my PADI DM final exam. I've gone throught the Knowledge Workbook and read the DM manual (cover to cover). I've read throught the Encylopedia sections for things I was unsure about, and others I knew fairly well, but just wanted to get all I could. I've not read...

My LDS quoted 'bout $200 for the PADI DM class and added PADI msrp for the Crew Pack (I forget, but it about doubled it). This is central CA, USA and early 2007. They provide rental equipment, even strongly suggesting I dive their BCD and not my own (the LDS carries different brands). Air...

Because I'm looking too, I've been reading about the algorithms. Most of the computers use a modified Haldanean model that is similar to that used in the RDP. That is all pretty cool, but there really had been a breakthrough with the reverse gradient bubble model (RGBM). If I'm...

I've been using one (the aussie version) for over 45 dives now. I don't have a drysuit, but have used it over my 7mm sleeve wrist, and have once strapped it above my elbow. This manuever is not recommended. My better half started wearing hers over her thigh until I got her a retractor for...

Thanks for the comments. Does anyone know if their model is Haldanean or if it uses a reverse-gradient bubble model? Divemeister Jim indicates it is on the conservative side - maybe it is RGBM???