Page 6
Doc. 13301-Tec-RevB (2022-05-25)
Technical Modes
Operating Instructions
2. Basic Operation
2.1. Turning On
To turn the Perdix 2 on, press both buttons together�
Do Not Rely On The Auto-On Feature
This feature is supplied as a backup for
when you forget to turn on your Perdix 2�
Shearwater recommends turning your
computer on manually before each dive
to confirm proper operation and to
double check battery status and setup�
Auto-on
The Perdix 2 will automatically turn-on when
submerged underwater� This is based on pressure
increase and not on the presence of water� When
auto-on is activated, the Perdix 2 will enter the last
configured dive mode�
Auto-on Details
The Perdix 2 turns on automatically and enters dive
mode when the absolute pressure is greater than 1100
millibar (mbar)�
For reference, normal sea level pressure is 1013 mbar
and 1 mbar of pressure corresponds to approximately
1 cm (0�4”) of water� So, when at sea level, the Perdix
2 will automatically turn-on and enter dive mode
when about 0�9 m (3 ft) underwater�
If at higher altitude, then the Perdix 2 auto-on will
occur at a deeper depth� For example, when at 2000
m (6500 ft) altitude the atmospheric pressure is only
about 800 mbar� Therefore, at this altitude the Perdix
2 must be submerged underwater by 300 mbar to
reach an absolute pressure of 1100 mbar� This means
the auto-on occurs at about 3 m (10 ft) underwater
when at an altitude of 2000 m�
2.2. Customizable Splash Screen
After turning on, the Perdix 2 Splash Screen is
displayed for 2 seconds�
Customizable start up text can be added using the
Shearwater Cloud Desktop app�
The image itself can also be customized using the
Shearwater Cloud Desktop App�
Note that the computer will revert to the standard
splash screen on a firmware update� The custom
splash screen will then need to be reloaded�
See the section on Firmware Update and Log
Download on page 74 for details�