Garmin Descent Shared Air Integration "doubling" SAC

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Alex Cline

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Jul 10, 2026, 11:42:15 PM (5 days ago) Jul 10
to Subsurface Divelog
Hello,

When I dive with my wife, we both have Garmin devices with air integration and have setup pairing between our devices so that we can both see each other's tank pressure. This means that both tanks show up in the Garmin dive log. This is throwing off Subsurface's SAC calculation because it thinks I had two tanks during the dive - one marked "OC-gas" and the other "not used", but the consumption rate is measured from both tanks.

I'd rather not delete my wife's tank from the equipment, since having that data is convenient in the logs. The calculated SAC rate is shown as a combination of hers and mine.

Is there a way to exclude her tank pressure data from the SAC calculation, or to calculate the rates independently for each tank?

Thanks!

Alex Cline

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Jul 12, 2026, 8:42:58 PM (3 days ago) Jul 12
to subsurfac...@googlegroups.com
I've submitted PR https://github.com/subsurface/subsurface/pull/4868 which I believe resolves this issue by excluding NOT_USED tanks from the consumed air calculation.

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