Support for Shearwater computers with multiple transmitters

Suggestions? Comments? Features you'd like to see?
Phiolin
Posts: 9
Joined: Sat Jul 28, 2018 6:09 am
Dive Computer: Perdix AI

Re: Support for Shearwater computers with multiple transmitters

Post by Phiolin » Sun Jun 20, 2021 7:35 pm

Sure, database sent.

Phiolin
Posts: 9
Joined: Sat Jul 28, 2018 6:09 am
Dive Computer: Perdix AI

Re: Support for Shearwater computers with multiple transmitters

Post by Phiolin » Sun Jun 20, 2021 8:00 pm

While at it, I saw in the profile you currently display both RMV and SAC rate.
I understand (as per this article: https://cavediverharry.com/rmv/) RMV is supposed to be the air consumption in like liters/minute of air that moves through your lung so it is not normalized to depth. SAC however is practically the same, but is adjusted to be the air consumption at sea level, so there is depth adjustment in this.

Is that how it is treated in MacDive? Or is RMV depth-adjusted/normalized as well?
I usually look at SAC to get a general indication of whether it was an easy/normal/heavy dive. But I can see you show SAC in bar/minute. Can we have a toggle to display SAC in liter/minute (of course would require definition of correct tank sizes for the dive), or is that supposed to be the RMV, which according to above article should not be the same however, so unsure if that's the case?
Can you shed some light on these two figures?

sch115
Posts: 1
Joined: Sun Jun 06, 2021 2:56 am
Dive Computer: Shearwater Perdix AI

Re: Support for Shearwater computers with multiple transmitters

Post by sch115 » Tue Jun 22, 2021 1:55 pm

nick wrote:
Sun Jun 20, 2021 5:06 pm
If you could log some recent dives and send them to me (Tools > Send Database) with a brief description that would be great. May have a couple of questions.
Thanks for doing great work Nick! Just about to send you my sidemount/transmitters database, more info in the mail!)

jsneveu
Posts: 5
Joined: Mon Aug 07, 2017 3:25 am
Dive Computer: Perdix AI

Re: Support for Shearwater computers with multiple transmitters

Post by jsneveu » Mon Jun 28, 2021 9:19 pm

Hi Nick,
Just switched to CCR (Divesoft Liberty) and was interested in this feature. I will hold off on buying a second transmitter until MacDive can support both though. Just so you know this feature gets an extra vote!

Thanks

js

Phiolin
Posts: 9
Joined: Sat Jul 28, 2018 6:09 am
Dive Computer: Perdix AI

Re: Support for Shearwater computers with multiple transmitters

Post by Phiolin » Tue Jul 27, 2021 7:27 pm

Just saw that Shearwater is adding a Sidemount mode to Perdix AI and NERD 2:
A sidemount mode has been added.
The differences in sidemount mode are:
• Reminder indicators are shown to prompt switching tanks.
• SAC and GTR are calculated on the pooled gas quantity of the two tanks. The tanks must be the same size.
• A RTR (Redundant Time Remaining) display option has been added. This is the GTR calculated only on the tank with less pressure (i.e. the GTR if the higher pressure tank was lost).
https://www.shearwater.com/wp-content/u ... nglish.pdf

So the computer calculates SAC based on both tanks now, at least for display.
Not sure if this affects how gas consumption is reported when downloading dives from the computer. I'll dive on Saturday and will give the new firmware a test to see how this imports into MacDive afterwards.

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