AAD Vigil Cuatro User Manual page 13

In freefall, the Vigil Cuatro continuously calculates the altitude.
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When the activation altitude (or lower) is reached by the jumper at a speed equal to or higher than the
factory-set parameters, the cutter of the Vigil .Cuatro will instantly fire and cut the closing loop of your emergency
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parachute (<0,002 sec). An "altitude correction" allows you to implement a positive or negative altitude difference
between the departure and landing levels (from +6000 ft to -6000 ft or from +2000 m to -2000 m) in steps of 150 ft or 50 m.
The Vigil Cuatro takes this altitude correction into account to calculate the new activation altitude.This principle also
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allows you to modify the activation altitude permanently if the airport where you take off and the landing zone
are at DIFFERENT altitudes or if there is a hillock near the drop zone.
Each mode «PRO», «STUDENT», «TANDEM» or «XTREME» has its own factory-set activation altitude and speed.
Choice of mode can be done in the "SETUP " menu (see Page 10 § 3.3). During your aircraftascent,
the Vigil Cuatro's red LED will briefly flash three times when it passes through its pre-set activation altitude.
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The Vigil Cuatro will automatically remain ON for 14 hours; it may of course be switched off manually before that time.
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The selected activation mode «PRO», «STUDENT », «TANDEM» or «XTREME» will remain visible on the LCD
display until the Vigil Cuatro is switched off or turns off automatically after 14 hours.
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To avoid an "airborne condition" (See page 25 for more detail) of your Vigil .Cuatro due to a difference in
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pressure that resembles 90ft or more (positive or negative altitude) compared to the "ground zero" reference
(pressure), you must ALWAYS manually shut down your Vigil .Cuatro at the end of the day and BEFORE leaving the
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drop-zone.