RobPNW
Contributor
I decided to go with both- AI wrist computer and transmitter and SPG. Eventually, I would like to have my AI computer on my right wrist, my transmitter, my SPG and a backup non AI computer on the left wrist.
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In a sense, but there's more to it.This points to my main motivation for asking my question in this thread. Is there really any useful or interesting use for the data that I'm not thinking of?
and I think the answer seems to be that only a more granular knowledge of your RMV/SAC.
And you're not even dead -- imagine that -- obviously, you've stumbled across the "Mercedes" model, as opposed to the Fiat, which still burns a bit of oil . . .My 1972 Italian Scubapro SPG still works fine, but only goes to 3500 psi and fits an old 3/8" HP port. This worked fine with my steel 72s and MK5/109.
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I’ve had an SPG fail as well. I do keep a spare SPG or two on the boat in my save a dive kit, but don’t bring it on the dive with me.Ive seen firsthand failure of oceanic, suunto and shearwater transmitters with divers. None had backup spg because they trusted their electronics. I always carry a backup spg in my bag for this reason, to loan out.
You say this like it’s a plus for the SPG. I see it as a minus, or at least neutral if you recognize the failure. A stuck SPG may not be detected right away. It may only be detected when the reading is significantly different than what is expected. Even if it is caught right away, an erroneous SPG reading is no better than a NO COMMS message on a computer screen. It’s very clear that the transmitter has failed, not always so clear with an SPG failure.SPG fails too but usually you can see that it is not reading accurately. Transmitter fails , you dont see much....
Any failure with my spg has been seen during pre dive check. Ive witnessed batteries crap out on transmitters during a dive. Ill trust an spg anyday eventhough I do like the tech stuff. I have electronic housings that costs over $10k and have nothing but problems....more inclined to using manual housings.I’ve had an SPG fail as well. I do keep a spare SPG or two on the boat in my save a dive kit, but don’t bring it on the dive with me.
You say this like it’s a plus for the SPG. I see it as a minus, or at least neutral if you recognize the failure. A stuck SPG may not be detected right away. It may only be detected when the reading is significantly different than what is expected. Even if it is caught right away, an erroneous SPG reading is no better than a NO COMMS message on a computer screen. It’s very clear that the transmitter has failed, not always so clear with an SPG failure.
The failure I’ve had with an SPG was not detectable during a pre-dive check. On initial pressurization, it read around 3200 psi. I turned off pressure, purged lines and it read 0 psi. Dive was shallow, so I checked after about 15-20 minutes. It now read about 2800 psi. I knew that couldn’t be right, but if it had gotten stuck at a slightly lower psi, I might not have noticed until later.Any failure with my spg has been seen during pre dive check.
That’s operator error in most cases, and often quite preventable. I change my transmitter batteries annually, definitely well before needed, but they are cheap and easy to do.Ive witnessed batteries crap out on transmitters during a dive.