Failsafe Configuration

Alex P -

The X8’s default failsafe configuration is optimized for close-range manual flight in open areas with strong GPS signal. For flying in areas with poor GPS signal or for flying missions, we recommend changing the following failsafe settings for improved fault tolerance.


Flying in Areas with Low GPS Signal

Some flying areas have poor GPS signal strength due to physical obstructions or lack of available satellites. (If you receive a pre-arm check failure for lack of GPS 3D lock on your ground station, it is likely that you are flying in an area with low GPS signal.) To fly without GPS lock, change the failsafe configuration to disable the horizontal geofence. This will remove the system requirement for GPS lock prior to takeoff and disable all GPS-dependent flight modes, allowing you to fly only using manual control (standard - altitude hold mode).

To Disable the Range Failsafe (Horizontal Geofence):

Connect the X8 to Mission Planner. Select Config/Tuning and Standard Params. This display shows the most frequently used ArduCopter parameters for easy access. Locate the Fence Type parameter; it will be set to Altitude and Circle by default. Switch to Altitude to disable the range failsafe, and select Write Params to save the changes to the X8.

geofence configure

Mission Planner: Standard Parameters

Flying with Low GPS Signal:

Prior to takeoff, the status LED will display blinking blue when ready to arm without GPS lock. The X8 can fly without GPS lock in only standard mode (altitude hold). If you do not have GPS lock prior to takeoff, do not activate loiter, RTL, follow me, or auto modes.

X8+ Flight Mode GPS Requirements

Mode GPS Requirement
Standard (altitude hold mode) No GPS lock required
Loiter GPS lock required
Auto GPS lock required before takeoff
RTL GPS lock required before takeoff
Land No GPS lock required
Follow Me GPS lock required

Flying Missions with Extended Range

If you plan to fly a mission that exceeds the default range limit of 300 m, follow the instructions above to disable the horizontal geofence. This will allow the X8 to travel farther than 300 m from the launch point during the mission without triggering an RTL. To fly a mission, the X8 requires GPS lock prior to takeoff. If GPS signal is lost during the mission, the X8 will trigger the default GPS failsafe behavior: switch to manual control (standard - altitude hold mode). When flying a mission with extended range, we recommend changing the GPS failsafe behavior to land when GPS signal is lost, improving the chances of safe recovery at greater distances.

To Configure GPS Failsafe Behavior:

Connect the X8 to Mission Planner. Select Config/Tuning and Standard Params. Locate the GPS Failsafe Enable parameter; it will be set to AltHold by default. Switch to Land to assign the X8 to land at the current position in the event of a loss of GPS signal, and select Write Params to save the changes to the X8.

gps failsafe config

Mission Planner: Standard Parameters

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