The Stratus 2 or 2S will auto-calibrate when powered on, but this calibration is not instantaneous. It is best to make sure you have a GPS lock when calibrating to allow the Stratus to have the best data for use. This auto-calibration occurs regardless of the Stratus' position.
If needed, the Attitude Indicator can be calibrated to straight and level as follows:
1. Tap on the settings button above the “data source” label (may say AHRS) in the lower-left of the Attitude Indicator/Synthetic Vision display.
2. Tap the “Calibrate” button in the upper right of the pop-up window.
3. Tap on the “Zero Pitch & Bank” button to automatically set the current condition as level. You can also tap on any of the four Pitch & Bank arrows to adjust the pitch and roll in small increments.
4. To save the calibration tap the “Save” button in the upper right corner of the display.
Image 1: How to calibrate the Stratus 2 for the Attitude Indicator or Synthetic Vision.
When powered on, the Stratus will save a manual AHRS calibration between power cycles so it does not automatically re-adjust to straight and level every time it is turned back on. This setting is useful for pilots who cannot calibrate the Stratus on the ground due to their aircraft (or Stratus device) not being straight and level, such as with tail dragger aircraft.
Note: The use of this feature depends on the Stratus not being moved after it is calibrated; moving the Stratus between flights will cause the saved calibration to become inaccurate, requiring a re-calibration during the next flight.