Shearwater Petrel EXT, Operation Manual, Page: 53 / 65

Shearwater Petrel
Revision 1.1.0 53 Shearwater Research Inc.
Altitude
The altitude setting when set to ‘Auto’ will compensate for pressure
changes when diving at altitude� If all your diving is at sea level,
then setting this to ‘SeaLvl’ will assume that surface pressure is
always 1013 mBar (1 atmosphere)�
Further, when diving at altitude, you
must
turn the computer on
at the surface� If the auto-on safety feature is allowed to turn the
computer on after a dive has started then the computer assumes
the surface pressure is 1013 mBar� If at altitude this could result in
incorrect decompression calculations�
Flip Screen
This function displays the contents of the screen upside down� This
is used for systems with a permanent connection to a rebreather� It
allows the computer to be worn on the right arm�
Display Setup
Display Setup
Units
Units
Brightness
Brightness
‣ Altitude
‣ Altitude
Flip Screen
Flip Screen
Change
Change
Save
Save
Feet
Feet
Auto
Auto
SeaLvl
Auto
Display Setup
Units
Brightness
Altitude
‣ Flip Screen
Exit Flip
Feet
Auto
SeaLvl
Diving At Altitude
When diving at altitude you must set this option to ‘Auto’ (the
default setting is ‘SeaLvl’)�