Garmin Mk2i - unlikely dive gas

[Dirk Hohndel]

Yeah, it would be good to know how this is all done in a multi gas scenario.

For now I'd be tempted to add code that says "if there is only one gas mix, but more tanks, assume the same gas is in all tanks"

/D

> On Jun 13, 2022, at 2:19 PM, Mark wrote:
> 
> 
> Hi Dirk,
> 
>>> I have a Garmin Descent Mk2i myself and have done a fair number of air dives with it, so I don't believe this is a general issue.
>>> But you may have set things up differently compared to the settings on mine - so I'll poke at your .FIT file and find out :)
>> 
>> From your FIT file it seems that you have more than one tank pod connected to your Garmin, but only one gas mix defined. That confuses our code a bit and it thinks that the second pod is connected to a dive with undefined gas data - and then it defaults to air for that
>> 
>> Do you actually have more than one pod attached? Are you using both? How does this look in the on-watch settings?
> I was thinking about this in bed after I sent you my FIT last night, but didn't have the brain power to work through it, or the desire to start wading through the Garmin menus.  Yes, I do have two transmitters connected and for all these dives only one gas mix.
> 
> The first transmitter is mine, and is set to be included in SAC calculations. The second transmitter is on my partner's regs - she's only just started diving, and I like to be able to keep an eye on her pressure at a glance. The second transmitter is excluded from SAC calcs. I've had a look through the dive setup on the watch, but it doesn't look like you assign a gas mix to a transmitter, even in multi-gas mode. I've not done multi-gas dives with my Garmin, so I don't know how it deals with matching mixes to cylinders (or indeed if it does).
> 
> Next single gas dive I do, I could add a backup gas and see if it assigns the backup gas to my second transmitter?
> 
> It'll probably be a while before I get out again, but I can experiment a bit over the next few dives if you think that will help.
> 
> When I first import these dives with two transmitters, the graph shows both cylinder pressures, but the SAC rate is blank until I delete the second cylinder. I assume something in there is also confusing Subsurface's SAC calcs?
> 
> Mark.

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