[Blauner]

When I did manage to arm, I could only do it in the non-GPS flight more. I could not arm in any of the GPS flight mode.

Hi, is this a problem or does it have to work exactly this way? I'm not very experienced.
Thank you.

[TheOtherCliff]

Any mode that needs GPS has additional minimum requirements (there are others that are good but not required):
- properly mounted and configured GPS
- twisted high current cables (ALL of them from battery to motor)
- home location set
- working, configured and calibrated external/aux mag
- INS13 (outdoor/navigation) selected for Attitude Estimation Algorithm
- properly set failsafes (RC and FC) (this is required even for non-GPS flight)

Some of these missing (the ones that can be detected) will keep it from arming, some missing will make it fly away or crash.

[Blauner]

Hi, I did not understand this well:
1) twisted high current cables (ALL of them from battery to motor).
2) home location set
And how do I set up failsafe on Turnigy 9X?
Is the home location set automatically? or not?

[f5soh]

About failsafe, take a look here and see differences between FC and RC receiver failsafe:
https://librepilot.atlassian.net/wiki/display/LPDOC/Input+Configuration#InputConfiguration-FailsafeSettings

More information about HomeLocation here:
https://librepilot.atlassian.net/wiki/display/LPDOC/Setting+Home+location

[TheOtherCliff]

Hi, I did not understand this well:
1) twisted high current cables (ALL of them from battery to motor).

Twist all cables:
- battery to battery plug
- battery plug to PDB (if you have one)
- PDB to ESC
- ESC to motor (3 wire)

[Blauner]

Hi, I did not understand this well:
1) twisted high current cables (ALL of them from battery to motor).

Twist all cables:
- battery to battery plug
- battery plug to PDB (if you have one)
- PDB to ESC
- ESC to motor (3 wire)

Hi, I do not have a PDB, the battery powers ESCs via a multiple cable.
Here's an example: http://www.ebay.it/itm/XT60-to-6-x-3-5mm-Bullet-RC-Hexacopter-ESC-LiPo-Battery-Power-Cable-Hex-UK-/262849589942?hash=item3d330e72b6:g:faEAAOxyVaBS5~lD

[TheOtherCliff]

Same rule applies, twist all high current (thick wire) cables from battery to motor.  That includes cables in "multiple cable".