Page 59
Doc. 13300-REC-RevB (2022-05-02)
Recreational Modes
Operating Instructions
11.9. System Setup
Date
Allows the user to set the
current date�
Clock
Allows the user to set the
current time� The format can
be set to AM, PM or 24 hour
time�
Unlock
Only to be used at the direction of Shearwater
technical support�
Log Rate
Sets how often dive samples are added to the
computer’s log� More samples will give a higher
resolution dive log at the expense of log memory�
Default is 10 seconds� Maximum resolution is 2
seconds�
Reset to Defaults
The final ‘System Setup’ option is ‘Reset to Defaults’�
This will reset all user changed options to factory
settings and/or clear the tissues on the dive computer�
‘Reset to Defaults’ cannot be reversed�
Note:
This will not delete dive logs, or reset dive log
numbers�
Date 8-Aug-2015
Clock 08:08AM
Unlock
Log Rate 10 Sec
Reset to Defaults
Next
Edit
System Setup
Calibrate
Calibration of the compass may be needed if the
accuracy drifts over time or if a permanent magnet
or ferromagnetic metal (e�g� iron or nickel) object is
mounted very close to the Petrel 3� To be calibrated
out, such an object must be mounted with the Petrel 3
such that it moves along with the Petrel 3�
Calibrate the Compass Each Battery
Change
Each battery has its own magnetic signature,
mostly due to its steel case� Therefore, recalibrating
the compass when changing batteries is
recommended�
Compare the Petrel 3 with a known good compass or
fixed references to determine if calibration is needed�
If comparing against fixed references, remember to
consider the local deviation between Magnetic North
and True North (declination)� Calibration is typically
not needed when traveling to different locations�
The adjustment needed then is the True North
(declination)�
When calibrating, rotate the Petrel 3 smoothly
through as many 3D twists and turns as possible in 15
seconds�
Compass Calibration Tips
The following tips will help ensure a good
calibration:
• Stay away from metal (especially steel or iron)
objects� For example, wrist watches, metal
desks, boat decks, desktop computers, etc�
These can all interfere with the Earth’s magnetic
field�
• Rotate to as many 3D positions as possible�
Upside down, sideways, on edge, etc�
• Compare with an analog compass to check
calibration�
