Transmitters on Short Hoses?

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If you noticed the stainless steel hoses are on a bungee and their location is on the top. In cave diving an SPG is mandatory . My regs sit against my chest for protection from cave walls and rocks. If the $hit hits the fan, I can always change out the regulator underwater using my deco or stage bottle regs.

I cave dive and switched from having both SPGs and transmitters to just transmitters. The extra line entanglement from either running the transmitters up top (which I didn't like because they stuck up weirdly above the reg/tank when transporting) or running the SPGs on top wasn't worth it along with the extra o-rings as potential failure points. If one of my transmitters cuts out, I'll just thumb the dive and exit like normal, no big deal. I keep an extra SPG on a short hose in my save a dive kit as a backup, so I can do a subsequent dive without issues.
 
I cave dive and switched from having both SPGs and transmitters to just transmitters. The extra line entanglement from either running the transmitters up top (which I didn't like because they stuck up weirdly above the reg/tank when transporting) or running the SPGs on top wasn't worth it along with the extra o-rings as potential failure points. If one of my transmitters cuts out, I'll just thumb the dive and exit like normal, no big deal. I keep an extra SPG on a short hose in my save a dive kit as a backup, so I can do a subsequent dive without issues.

well that’s the great thing about sidemount cave diving. If you see 10 sidemount cave divers you will see 11 different gear configurations. We all enjoy doing the same activity just do it differently.
 
I sidemount with transmitters. I use an SPG on a stage as I usually dive with three tanks. Recently I had my stage show 3400 psi on my AL80 stage. That seemed a bit odd so I decided to check it against a backup SPG. When I checked again before taking the SPG off it said 4,200 psi. The screw on the faceplate had come out and the faceplate was rotating giving me no idea as to the actual pressure in the tank. I took the failed ScubaPro brass and glass SPG off and swapped it out with an old plastic one with Aqualung branding on it. SPGs fail in a number of ways. I'm glad I discovered it before the dive started.
 
In cave diving an SPG is mandatory.

Two of the very best cave divers/instructors/explorers that I have ever met use transmitters instead of SPGs. So apparently its not mandatory to use SPGs, unless you meant to say 'SPGs or transmitters'. I.E. some kind of instrument that tells you how much gas you have.

I'm sure at some point in the aviation world there were all kinds of discussions about replacing mechanical instruments with electronic ones, and resistance to that transition. Maybe there still is, I really don't know.
 
Two of the very best cave divers/instructors/explorers that I have ever met use transmitters instead of SPGs. So apparently its not mandatory to use SPGs, unless you meant to say 'SPGs or transmitters'. I.E. some kind of instrument that tells you how much gas you have.

I'm sure at some point in the aviation world there were all kinds of discussions about replacing mechanical instruments with electronic ones, and resistance to that transition. Maybe there still is, I really don't know.

Transmitter only is becoming more common for sidemount. For BM because of the ease of having a SPG and still being streamlined I haven't seen anyone going transmitter only.

On the aviation side, you won't see the old backup mechanical instruments on any of the new airliner or business jet designs. Instead they have a dedicated electronic standby display, that replicates the PFD but in a smaller format, about the size of a traditional instrument.
 
Transmitters only in sidemount on 6" hoses. In the rare case of failure. I will stop the dive while still having a transmitter working
 
Thank you all for the replies. I ended up going with transmitters only without the short hoses. This provides only 1 potential failure point per reg rather than 3 with the short hose. Because with sidemount the transmitters point straight down almost flush with the tank, there’s much less likelihood of someone yanking on them. I may need to use short hoses later with AL 80s as I’ve heard that the transmitters may not fit.
 
https://www.shearwater.com/products/peregrine/

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