sac

I have a Garmin MK2i with T1 transmitter and Suunto Eon Steel Black with transmitter. I get two very different readings on each computer for SAC rate. How do I do an apples to apples comparison/ convert for them to show the same number.

I’m a new diver, and I’m getting around 30min dives out of a 15L when averaging around 14m on dives. Is there any kind of exercises I can do to improve this ? Or is it just experience thing ? Thanks guys.

So, I've been diving for a couple of years and have logged 72 dives. I have always been comfortable underwater and can also perform decent freediving. When swimming in the sea for fun I'm ok with going down to 10 meters to explore and hold my breath for a minute, comfortably coming back up...

I'm using a Suunto Eon Core computer with the transmitter for several months by now. I noticed that it reports a very high SAC rate at the beginning of every dive. Sometimes, the initial SAC rate is as high as 80 l/min. I wonder what can be the reason for that? Here is an example of a pool...