Basics; Activation - Aqua Lung NS117121 Owner's Manual

BASICS

Welcome to your new i550C. The i550C is an easy to use dive computer utilizing a two button interface. Divers
may choose between either Dive or Gauge Mode. Though the i550C is easy to use, you will get the most out of
your new i550C if you take some time to familiarize yourself with its displays and operation. Information has been
organized into easy to follow sections to aid you in learning all you need to know. There is also a glossary at the
end of this guide for any terms that may sound unfamiliar.

ACTIVATION

To activate the i550C, press and release either button. The i550C will also turn on if its metal contacts become
wet and you descend greater than 1.5 m (5 ft) for 5 seconds. The H2O ACT (water activation) feature may be
disabled if that is your preference. Disabling the H2O ACT feature is described in the Dive Surface Mode chapter,
p. 26.
• Upon activation the unit will enter a Diagnostic Mode. The i550C checks the display and voltage at this time to
ensure that everything is within tolerance.
• It will also check ambient barometric pressure, and calibrate present depth as 0 m (ft). When at 916 m (3001 ft),
or higher, it will adjust depth for the higher altitude.
• After the Diagnostic check, the i550C will display the surface screen in Dive Mode.
NOTE: The i550C has no off button or command. If no buttons are pressed or dives made within 10
minutes the computer will enter Sleep Mode. The screen and Bluetooth (if set ON) shut down, to save
battery life, while in Sleep Mode. To wake the computer press any button. Additionally, the unit will
completely shut itself off after 2 hours of inoperation. However, the i550C will stay on, in Sleep Mode,
for a 24 hour period after the dive, counting down FLY (time to fly) and SAT (desaturation time) if a dive
has been made.
© Aqua Lung International, Inc. (2018)
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GETTING STARTED
Doc. 12-7909-r04 (10/31/18)