Dives in especially cold water (<3 °C)
JACK can also be used for dives in especially cold water (<3 °C).
However, exposure to especially low temperatures can negatively
affect the voltage remaining in the battery, decreasing the
computer's burn-time.
If you dive in especially cold water, the battery voltage can run out
much faster than normal. Therefore it's always a good idea to
recharge the battery before diving in extreme conditions.
m WARNING!
In the case of dives in especially cold water (<3°C), recharge
the computer to 100% or ensure that you have at least a
50% charge.
m WARNING!
Dives in especially cold water (<3°C) require specific training.