
- Connect the autopilot to Mission Planner and open the DataFlash Logs tab in the DATA view.
- Choose Download DataFlash Log Via Mavlink and select the logs to download. Mission Planner saves them in its logs directory.
- Retain the original log. DataFlash logs are recorded onboard; .tlog files are recorded by the ground station over the telemetry connection.
Introductory guide. Follow current official requirements and manufacturer instructions for your operation.
Reference: ArduPilot: downloading and analyzing DataFlash logs ↗