Horizon Hobby Blade 350 QX2, Instruction Manual

12

EN

GPS Functionality of the 350 QX2

To acquire a reliable GPS signal, it is important the 350 QX2 has a clear view of 
the sky. Obstructions that can affect the aircraft’s ability to acquire an acceptable 
signal include:

•  Flying close to or around tall/big buildings
•  Flying under dense vegetation
•  Flying indoors or under a structure

If you lose or cannot acquire a GPS lock and home position, the aircraft will not 
have Stick Relativity, SAFE Circle, Position Hold or Return Home functions avail-
able.

It is not possible to use 

Smart Mode

 without having GPS enabled. If the

350 QX2 is initialized without GPS enabled, it will default to 

Stability Mode.

 The 

aircraft will still be capable of altitude command. 

If you do not have a GPS signal, try maneuvering the 350 QX2 by steering with 
forward elevator and rudder only.

CAUTION:

 Do not attempt to fl y the 350 QX2 with GPS enabled while 

indoors or in a location where the GPS signal is known to be poor, as 

loss of signal could result in a crash.

GPS Functions

(

see the Binding section for turning GPS functions ON and OFF

)

With 

GPS ON

•  If the 350 QX2 took off with GPS lock and a home position set, when Return 

Home mode is activated the quadcopter will fl y back to the start position 
(maintaining altitude along the way), then reduce altitude to land.

•  If the 350 QX2 should lose GPS when Return Home mode is activated, it will 

land quickly using the barometric pressure sensor to maintain the descent 
rate.

•  If the 350 QX2 took off without GPS lock, but acquires a GPS signal in fl ight, 

it will land slowly using GPS to hold its position and barometric pressure 
sensor to maintain the descent rate when Return Home mode is activated.

•  If the 350 QX2 loses GPS during landing in Return Home mode, it will 

increase the rate of descent and land quickly to avoid drift.

•  If the 350 QX2 deviates too far from its intended GPS path when in Return 

Home mode, it will descend using the barometric pressure sensor to main-
tain the descent rate. This could happen if the fl ight control system loses its 
orientation because of aggressive fl ight in 3 axis mode.

•  Once the 350 QX2 has landed in Return Home mode, it will disarm the 

motors.

With 

GPS OFF

•  If Return Home mode is activated, the 350 QX2 will level off and land 

quickly using the barometric pressure sensor to maintain the descent rate.

•  Once the 350 QX2 has landed in Return Home mode, it will disarm the 

motors.

GPS Failure

Upon GPS failure, the 350 QX2 will respond according to the following conditions:

Smart Mode:

 (rapid Green fl ashing LED)

If the 350 QX2 is in this mode and the GPS fails, the quad will default to 

Stability Mode.

 The aircraft will still use the pressure sensor to maintain

altitude and control rate of descent. If GPS is reacquired, after 5–10 seconds 
of reliable GPS signal the 

Smart Mode

 functions are returned to normal 

AP Mode:

 (long Purple, two short Green fl ashing LED)

If the 350 QX2 is in this mode and the GPS fails, it will not switch
to 

Smart Mode

 and will not enter GPS hold, but will otherwise function 

normally. If GPS is reacquired, after 5–10 seconds of reliable GPS signal
the 

AP Mode 

functions are returned to normal.

Stability Mode:

 (long Blue, two short Green fl ashing LED)

If the 350 QX2 is in this mode and the GPS fails, it will not switch to 

Smart 

Mode

 and will not enter GPS hold, but will otherwise function normally. If 

GPS is reacquired, after 5–10 seconds of reliable GPS signal the 

Stability 

Mode

 functions are returned to normal.

Loss of Transmitter Signal

If the transmitter signal is lost for any reason, the 350 QX2 will respond accord-
ing to the following conditions:

•  If the motors are not turning, the 350 QX2 will disarm.

•  If the motors are turning but the 350 QX2 is not fl ying, it will turn off the 

motors and disarm. 

•  If the 350 QX2 is fl ying and has a good GPS lock with a home position set, 

it will activate the Return Home function upon the loss of the transmitter 
signal. 

•  If the compass is not connected or faulty, or if there is no GPS lock, the 350 

QX2 will descend slowly upon the loss of the transmitter signal.

•  If the pressure sensor is not working, the 350 QX2 will reduce power to initi-

ate a controlled descent upon the loss of the transmitter signal.