Diving with 2 different computers?

[FF / EMT]

This is NOT correct unless you are going to take a 24 hour time out from diving to be able to switch to the second computer that was sitting on the surface and not keeping track of your residual nitrogen. If you want to use the back up computer to continue diving without losing time sitting on the surface to offgas, then your back up must be with you diving at the same time your primary computer is with you.

Maybe reading comprehension isn’t your strong suite. I’m pretty sure I stated that if his primary fails to use his backup, meaning his backup could fail at depth, I re read my post and don’t even see the word “surface” but I’ll check again

 

[Hatul]

I agree with what others wrote about not using the Suunto as a backup to the Teric. A few years ago I was diving in Cozumel with a Galileo Sol as primary and Vyper (same vintage as your Cobra) as backup. We had a short surface interval and the Vyper gave a very short no deco time so at the end of the dive the Vyper went into deco while the Galileo had plenty of non deco time. Eventually I lost my patience and surfaced with the Vyper still in deco stop, locking out the Vyper for 48 hours.

Now I dive with the Scubapro G2 as my primary and a Scubapro Tec 3 G as the backup, both use similar algorithms and are set up to be similarly conservative.

 

[outofofficebrb]

Maybe reading comprehension isn’t your strong suite. I’m pretty sure I stated that if his primary fails to use his backup, meaning his backup could fail at depth, I re read my post and don’t even see the word “surface” but I’ll check again

Pick one and use it, if it fails then use the there other as a backup, don’t use both at the same time

I also extrapolated what some others did in reading your post. What you probably meant was to dive with both so that both accumulate the correct nitrogen load but to just follow the instructions of one while in the dive. Should the one that you are following fail, then follow the instructions of the other one. Your post did not convey this and made it sound like one should not dive both at the same time on a dive. Regardless, I don't think the snark was necessary; just clarify what you meant if that is not what you meant.

 

[Manatee Diver]

Eventually you are going to have to make a choice, either have to dive what the Cobra tells you, or ignore it allowing it to get bent and thus become useless as a backup computer.

IME on the first dive the Suunto Cobra will have plenty of NDL time left, approximately 5-10 minutes more than your Teric. While on second or third dives the Cobra will be much more conservative, often 10-15 minutes less NDL time, with it quickly racking up deco time compared to the Teric.

 

[caruso]

Maybe reading comprehension isn’t your strong suite. I’m pretty sure I stated that if his primary fails to use his backup, meaning his backup could fail at depth, I re read my post and don’t even see the word “surface” but I’ll check again

Rude and unnecessary. Your post was vague in the wording: "pick one and use it". If you're diving with both, you're using both, albeit one is passive.

 

[ThatDogDontHunt]

This is a well worn topic.
- dive both (all) of your computers
- use the most conservative as your primary

Dive both (all): my backup died once midweek on a trip. No worries, I had an extra backup in my save a dive kit. It took about a day and a half for my non dived extra backup to match my primary. Dive them all...

A locked out computer in your BCD pocket is mostly useless.

 

[FF / EMT]

. If you're diving with both, you're using both, albeit one is passive.

If you say so...

 

[caruso]

Well think about it, with an analogy. If you don't look at an odometer in a car during a particular drive, is it being used? Sure, it's doing it's job, silently clocking off the miles, at some point it might be checked such as during an inspection, or for oil change purposes, or at resale. Even if it's not looked at. Same could be said for oil pressure gauges, or temperature gauges in various vehicles. Do you know some days I don't even check the time on my watch! But it's right there on my wrist, just in case I need to check it.

 

[ThatDogDontHunt]

Well think about it, with an analogy. If you don't look at an odometer in a car during a particular drive, is it being used? Sure, it's doing it's job, silently clocking off the miles, at some point it might be checked such as during an inspection, or for oil change purposes, or at resale. Even if it's not looked at. Same could be said for oil pressure gauges, or temperature gauges in various vehicles. Do you know some days I don't even check the time on my watch! But it's right there on my wrist, just in case I need to check it.

I think we all agree that a backup dive computer in your save a dive kit is mostly useless. Been there with a backup backup computer. Dive everything you own...

 

[caruso]

I think we all agree that a backup dive computer in your save a dive kit is mostly useless. Been there with a backup backup computer. Dive everything you own...

Well let's play devil's advocate. It's a slow day for me at work. I dive an Oceanic AI on my wrist, an identical one on a retractor in my BCD pocket, both synced to the same transmitter. I hooked up my girlfriend the same way and her son has the same as a primary and a Veo non AI as a backup (same software and algorithm). As a backup to all our backups I keep another identical AI wrist computer AND transmitter in my save-a-dive-kit as a backup to our backups. Of course it won't have the same NDL info but it's a lot better than nothing.