Your first replay

For users with an existing PX4 ULog (.ulg) file. No PX4 source tree required.

If you haven't installed Hawkeye yet, see Installation first.

hawkeye --replay path/to/flight.ulg

Hawkeye opens, pre-scans the log for vehicle type and flight mode transitions, prints a summary to the console, and starts playing the flight automatically:

ULog replay: flight.ulg (287.3s, 289 index entries)
  Flight modes: Takeoff@12s Mission@15s RTL@250s Land@276s
  Takeoff: 12.3s (CUSUM conf=92%)

Use the transport keys to navigate:

Key	Action
Space	Pause / resume
+ / -	Increase / decrease playback speed
← / →	Seek 5 seconds
Shift+← / Shift+→	Frame step (20 ms)
R	Restart from beginning

See ULog Replay for the full list of transport controls, marker keybinds, and analysis features.

Next steps

• ULog Replay — Markers, interpolation, seek, and frame-by-frame inspection
• First swarm — Load multiple logs together
• Command-Line Reference — Every CLI flag with examples