forum.heinrichsweikamp.com

Is there even a possibility to turn it on? Or if I needa a gauge I can use the Apnea mode?

Is there a difference between apnea and gauge mode?

There are differences, like the Surface time, "last descent" in Apnea mode. The hwOS sport has no Gauge mode, sorry.

Consider the hw Bottomtimer in case you want a Gauge-Mode unit without spending too much money: https://heinrichsweikamp.com/index.php/ ... timer.html

regards,
Matthias