Sentry and Sentry Plus AHRS can be calibrated automatically or manually. Calibrating Sentry AHRS ensures the backup attitude indicator displays a level horizon when straight and level. The recommended method is to calibrate AHRS automatically.
Automatically Calibrating AHRS
To automatically calibrate Sentry or Sentry Plus AHRS, perform the following:
- Connect the Sentry to the iPad or iPhone.
- Open ForeFlight Mobile.
- Go to the Maps page.
- Tap on the Attitude Indicator button.
- Tap the AHRS settings (gear) button in the AHRS view.
- Turn the switch on next to Auto Zero Pitch & Bank.
When Auto Zero Pitch & Bank is enabled, ForeFlight constantly evaluates pitch, bank, and acceleration. When ForeFlight determines that the aircraft has been straight and level with no acceleration for more than ten seconds, it automatically cages the AHRS and displays zero degrees of pitch and roll.
Manually Calibrating AHRS
To manually calibrate AHRS, perform the following:
- Connect the Sentry to the iPad or iPhone.
- Open ForeFlight Mobile.
- Go to the Maps page.
- Tap on the Attitude Indicator button in the header.
- Tap the AHRS settings (gear) button in the AHRS view.
- Verify that the mount location is correct.
- Turn the switch off next to Auto Zero Pitch & Bank (if enabled).
- Tap Calibrate AHRS.
- If the aircraft is level, tap Zero Pitch & Bank. Tap the arrows as needed until the yellow reference lines align with the horizon.
- Tap Done in the upper left corner of the screen.
When Sentry or Sentry Plus are manually calibrated, the pitch and roll corrections are saved to the device. Sentry AHRS corrections are sent to ForeFlight each time Sentry connects, eliminating the requirement to calibrate each time ForeFlight is connected manually.
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