Cause:

The aircraft suddenly detects an obstacle below the safe distance threshold in its forward path and cannot avoid it in time (e.g., water mist, sand, thin wires, radar noise, etc.). If the radar identifies an obstruction that cannot be avoided, it will report "no route available." This is part of the J100 safety recognition settings, which are highly effective in detecting linear obstacles. If terrain fluctuations cause radar surface contamination (e.g., from liquid chemicals), clean the radar surface with alcohol. Wipe it clean after each flight to ensure the highest level of safety.

Troubleshooting Methods:

1、Switch to manual mode, use the radar display and FPV (First-Person View) to maneuver the aircraft forward or backward, bypassing obstacles shown on the radar. Then, switch back to automatic mode and select "Return to Projection Point" (do NOT choose "Return to Breakpoint").

2、Enable terrain-following mode only, ensure there are no overhead wires, then switch to manual mode and use the radar display and FPV to ascend the aircraft 3–5 meters. Finally, switch back to automatic mode and select "Return to Breakpoint" or "Return to Projection Point".

3、If the takeoff area has heavy dust/sand, set a higher takeoff altitude to reduce interference from dust particles.