The sample rate controls how often information from the dive is saved to the active log. The default sample rate is 20 seconds in air and nitrox modes, and 2 seconds in free dive mode.
To change the sample rate:
The sample rate options in air and nitrox modes are: 10, 20, 30 and 60 seconds.
The sample rate options in free dive mode are: 1, 2 and 5 seconds.