Model: CUAV V5 with Multi-Link v1.0
Firmware: No updates or changes performed
System: ArduPilot
GPS Module: Here3 (Neo 3) connected to GPS & Safety port
Control Apps Installed on Remote:
• Fly GCS
• SkyDroid
• No firmware updates made to remote controller
⸻
Observations
1. Compass Calibration Behavior:
• Calibration process reaches 99% but fails to complete.
• Compass remains inconsistent even after multiple attempts.
• Successful calibration eventually achieved outdoors, after switching to calibration via Fly GCS.
• Calibration would not start indoors or via QGroundControl on iMac due to USB disconnection requirement.
2. Calibration Process:
• USB-C cable was unplugged from iMac.
• Calibration then performed successfully using Fly GCS app outdoors.
• After calibration, drone was rebooted by unplugging the battery per manufacturer procedure.
3. Post-Calibration Errors:
• Upon reboot indoors, drone displayed:
• Prearm: GPS speed error 1.4 (needs < 1.0) → Triggered because drone was moved indoors, and GPS speed appeared too high.
• Prearm: Safety switch → No external safety switch used; confirmation that it’s part of the GPS module (likely on top of the Here3).
• Inconsistent compass → Moving back outdoors cleared this warning.
• Once outdoors, safety switch cleared and motors armed successfully.
⸻
Diagnostic Tools Used
• QGroundControl on iMac (via USB-C)
• Used for early diagnostic readings and sensor validation
• Mavlink console accessed under Analyze → Tools
• Verified presence of dual magnetometer instances
• Fly GCS App
• Used to perform successful compass calibration
• SkyDroid App
• Installed on controller but not used for calibration
⸻
Manufacturer Contact
• User initiated direct communication with Arris Corporation:
• Left messages on various Arris Hobby websites
• Made phone calls to support channels
• Awaiting response regarding compass calibration failure and error messages
⸻
Notes
• No firmware changes were made to this drone or its controller.
• Calibration success was environment-dependent (outdoor only).
• Mavlink console showed two working magnetometer instances with valid readings.
• Drone is currently operational and passes pre-arm checks outdoors.
If this helps someone you’re welcome