When the Vigil® is switched ON (the LCD display shows the pre-determined mode and the eventual altitude correction), it stays in a stand-by mode and recalibrates itself automatically every 32 seconds at takeoff level.
During the takeoff and after passing 150 ft (46m) above or under takeoff level, the Vigil® will switch to an active status in a time of max; 32 seconds. Vigil's® active status will be confirmed by 3 short flashing of the green LED.
The minimal level for the Vigil® to switch to the active status will depend on the ascend rate of the plane above the 150 ft (46m). The Vigil® will be in active mode in a time of maximum 32 sec (next calibration) after crossing the +/- 46m altitude level.