Troubleshooting: AHRS Issues

AHRS not working or showing incorrect attitude? Follow this guide.

First: Do You Have AHRS?

AHRS is an optional upgrade. Check if your unit has it: 1. Go to http://192.168.10.1 2. Check GPS/AHRS tab 3. If “AHRS” shows as unavailable, you don’t have the module installed

AHRS upgrade installation →

AHRS Shows Wrong Attitude

Check Orientation Setting

Stratux needs to know how it’s mounted in your aircraft.

Default orientation: - Left side of cockpit - Antennas pointing up (toward sky) - Logo facing pilot

If you’ve mounted it differently: 1. Go to http://192.168.10.1 → Settings 2. Click “Set AHRS orientation” 3. Point the nose of the unit toward the sky 4. Tap “Set Forward Direction”

📺 Video: AHRS Orientation & Calibration

Calibrate the Gyros

1. Park aircraft on level ground
2. Connect to http://192.168.10.1
3. Go to GPS/AHRS tab
4. With Stratux stationary, tap “Calibrate Gyros”
5. Wait for confirmation

Important: Aircraft must be level and Stratux must not be moving during calibration.

Heading Wrong?

The magnetometer (compass) can be affected by nearby metal or electronics.

Fixes: - Recalibrate away from large metal objects - Move Stratux away from other avionics - In some aircraft, accurate heading may not be possible due to interference

AHRS Drifts or Goes Crazy

Loose Mounting

AHRS needs stable mounting. If it can shift or rotate, attitude will be wrong. - Secure firmly to aircraft structure - Use velcro or strap kit: Strap kit video

Vibration

Excessive vibration can overwhelm the gyros. - Add foam padding under mount - Avoid mounting directly on engine firewall

Temperature

The AHRS chip works best when warmed up. On cold days, give it a few minutes.

ForeFlight Not Showing AHRS

ForeFlight requires extra configuration for Stratux AHRS:

1. Enable third-party AHRS in ForeFlight
2. Install Danger Zone profile (allows non-Stratus AHRS)
3. Calibrate in ForeFlight separately from Stratux calibration

📺 Video: ForeFlight AHRS Setup

ForeFlight docs: AHRS Calibration

AHRS Chip Not Detected

If the status page doesn’t see AHRS:

1. Check installation — is the AHRS module firmly seated?
2. Check fan cable — red wire to positive
3. Power cycle and check status again

The AHRS module also controls the cooling fan. If the fan doesn’t spin (when hot), the module may not be connected properly.

Pseudo-AHRS

If you don’t have the AHRS module, Stratux outputs “pseudo-AHRS” based on GPS: - Gives rough pitch/roll based on acceleration - Not accurate — only for basic synthetic vision - Cannot replace a real attitude indicator

For accurate AHRS, install the upgrade module.

Need more help? See the detailed AHRS wiki or visit support.crewdogelectronics.com.