tank size setting

[Scubanomad]

Anyone changes the tank size setting when switching from a 80 (12L) to a 120 (15L) tank? Also wonder where to change the setting in the Suunto computer? Does it matter?

 

[Hatul]

I assume you're asking about an air integrated computer? The tank setting is usually done in the desktop software to allow the thing to compute your SAC rate. The dive computer is concerned with remaining air time and there is no need to know the size of the tank to compute that.

 

[ajduplessis]

The settings for tank size, dive/gas plans are done between your ears before you enter the water. Stop worrying about useless configurations setting on the dive computer. Focus on the important stuff like proper planning and then executing that exact plan.

The desktop software will calc your SAC automatically. Rather use that as "best case" input when considering your dive plan and apply some sanity (fat).

 

[RonR]

Anyone changes the tank size setting when switching from a 80 (12L) to a 120 (15L) tank? Also wonder where to change the setting in the Suunto computer? Does it matter?

The Atomic Cobalt allows you to do this, and keeps track of your SAC internally. That recent average SAC becomes an additional input to the gas time remaining calculation during the early part of a dive. But the biggest factor by far in that GTR calculation is your actual rate of pressure drop on the dive, and for that you don't need to know tank size. It is useful to have SAC for the internal planning/ dive simulator functions, as it helps in predicting gas requirements for a particular profile.

Most computers don't keep track of this or have a place to enter tank size. If you just want to know SAC you can use dive log software- where you would need to input the tank size. Then you should be able to see your SAC for any point in the dive.

Ron