There are various modes that can be toggled on or off. Modes can be enabled/disabled by stick positions, auxillary receiver channels and other events such as failsafe detection.
The default flight mode does not stabilize the multicopter around the roll and the pitch axes. That is, the multicopter does not level on its own if you center the pitch and roll sticks on the radio. Rather, they work just like the yaw axis: the rate of rotation of each axis is controlled directly by the related stick on the radio, and by leaving them centered the flight controller will just try to keep the multicopter in whatever orientation it's in. This default mode is called "Rate" mode, also sometime called "Acro" (from "acrobatic") or "Manual" mode, and is active whenever no auto-leveled mode is enabled.
If your flight controller is equipped with a 3 axis accelerometer (very likely), then you can enable one of the two available auto leveled flight modes.
## Mode details
### Angle
In this auto-leveled mode the roll and pitch channels control the angle between the relevant axis and the vertical, achieving leveled flight just by leaving the sticks centered.
### Horizon
This hybrid mode works exactly like the previous ANGLE mode with centered roll and pitch sticks (thus enabling auto-leveled flight), then gradually behaves more and more like the default RATE mode as the sticks are moved away from the center position.
### Headfree
In this mode, the "head" of the multicopter is always pointing to the same direction as when the feature was activated. This means that when the multicopter rotates around the Z axis (yaw), the controls will always respond according the same "head" direction.
With this mode it is easier to control the multicopter, even fly it with the physical head towards you since the controls always respond the same. This is a friendly mode to new users of multicopters and can prevent losing the control when you don't know the head direction.
Spare auxillary receiver channels can be used to enable/disable modes. Some modes can only be enabled this way.
Configure your transmitter so that switches or dials (potentiometers) send channel data on channels 5 and upwards (the first 4 channels are usually occupied by the throttle, aileron, rudder, and elevator channels).
_e.g. You can configure a 3 position switch to send 1000 when the switch is low, 1500 when the switch is in the middle and 2000 when the switch is high._
Configure your tx/rx channel limits to use values between 1000 and 2000. The range used by mode ranges is fixed to 900 to 2100.
When a channel is within a specifed range the corresponding mode is enabled.
Use the GUI configuration tool to allow easy configuration when channel.
### CLI
There is a CLI command, `aux` that allows auxillary configuration. It takes 5 arguments as follows:
