Hi Mark, lovely episode. My favorite so far. Keep up the good work!

Useful preso. I track my RMV manually, simple calc to do.

Awesome episode! May i know what is the blue bracelet that you are wearing called? and where can i purchase it from?

@ScubaDiverMagazine

21 күн бұрын

That is from a company called Bracenet. They make a range of items from collected ghost gear. All of their bracelets are named for different seas and oceans, the blue one is named Arctic Ocean.

@KitoriSin

19 күн бұрын

@@ScubaDiverMagazine Thank you! 😊

Isn't the internal volume of a 12l cylinder something like 11.1l?

@ScubaDiverMagazine

24 күн бұрын

An Ali 80 has an internal volume of 11.1L. Steel 12L is the most common size cylinder here in the UK

My Garmin (MK2i) gives me a SAC rate in L/min as well as RMV in L/min. I understand the SAC rate is the consumption adjusted for depth, ie at the surface and RMV is the actual consumption. Do you know if my understanding is correct?

@Teampegleg

13 күн бұрын

Yes but that isn't how anyone else would use RMV. Traditionally SAC was a volume measurement, it was something you calculated after the dive taking pressure used, average depth, and calculating that against your tank capacity. Then SRI came along and had real time SAC in pressure per minute. And then because people were giving pressure based SAC, instead of insisting on people diving units, they repurposed the term RMV form medicine. RMV is used by some for what SAC used to be volume per min at surface. I use SAC for volume with units and never use a pressure based SAC.

#askmark Hi! Not Shearwater or dive computer related (although my husband and I have both ordered the Peregrine TX!). Would love to know your thoughts on XS Scuba’s Highland Backplate and wing products. Our local dive center carries them (and their regulators) and we cannot find any videos, good or bad. Thanks!

@ScubaDiverMagazine

24 күн бұрын

I've used a few of their bits and they're decent quality. It's hard to go far-wrong with BP/W hardware... They're not a particularly _flashy_ brand so you won't find a lot online about them but, the quality and materials are fine. Have fun with the Peregrines, they're a top tier computer

@JulieVenhaus

22 күн бұрын

@@ScubaDiverMagazinethanks!

#ASKMARK My predix ai does a calculation for GTR (gas time remaining) , do you know how that calculation works ?

@ScubaDiverMagazine

24 күн бұрын

Shearwater are clever with this one also: They take the known tank pressure and subtract enough gas to ascend to the surface at a safe rate and also subtract enough gas for a reserve. This remaining gas is then divided by the ambient pressure and your SAC rate to work out how many minutes it would take for you to breath down that gas and still be able to ascend to the surface with some reserve. But. It won't take deco or safety stops into the calculations so, don't go right up to the limit or you may need to go into your reserve

Hi Mark, (Hi Shearwater, if any of you are reading this), I use the Perdix 2ti and every now and then (in 22 dives 2x) I have the problem that the SAC rate was very high (45bar/min or higher). I can't explain why this error occurred. Do you have any idea? My normaly SAC Rate is about 1,6bar/min

@Yggdrasil42

26 күн бұрын

I would send that dive log to Shearwater support. Definitely interesting.

@a.karley4672

26 күн бұрын

Hmmm. How *smooth* is the value from your *electronic* cylinder pressure gauge? If this is (erroneously) dropping to zero (or a low value), then you'd see that effect. I've seen this in (in house) lab equipment from loose wires in the analytical machinery. But we could go to manual calculation and get round the problem. Next break in operations, out with the soldering iron and solder the pressure cell's connections. Bug report filed to the technician who built it. The last time I calculated "SAC" rates was for cave diving, to work out if I'd be able to make a particular air bell before reaching 'thirds'. But always, the answer to such questions is "bigger tanks". Skip-breathing isn't really an option. I'm trying to remember what 1cu.ft/minute is in L/min. (28.4 L/cu.ft - I had to work it out.

@ozDomaNET

25 күн бұрын

3 suggestions: flooded/damaged transmitter or make sure your octo. is not free-flowing during your dive or if it is not happening during DSMB deployment. Shearwater is probably not as good and reliable as it used to be. My Perdix2Ti pressure sensor failed just after 6months/280 dives (soaked in fresh water every day) Another guys Teric pressure sensor also failed (within Waranty period).

Hi Mark. What kind of watch you are wearing? Is it a dive watch? If it is, what brand is that? I'm in the market for a dive watch/computer right now. Thank you!!! :)

@comebackdk

26 күн бұрын

it look like a TERIC

@ScubaDiverMagazine

24 күн бұрын

Yeah, that's my Shearwater Teric. It felt right to wear it when Shearwater were sponsoring the video. It comes in a few colours now and there's also the Shearwater Tern if you're interested.

Wait.... Shouldn't sac rate be in liters/min, rather? Surely the size of your tank doesn't affect your sac rate 😅

#askmark Please reduce the sensitivity on the mic. 😂 It picks up everytime you swallow

@ScubaDiverMagazine

Күн бұрын

My bad, I usually wear polos to move it away from my neck, I'll do better next time