dji XP3.1, Руководство пользователя

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coincident direction of the coordinate frame on box and one of the
helicopter (output wire points to the head of helicopter). No occluded objects
are allowed around. It should be installed at the half of the tail pipe
approximately, and let it be far away from the servo.(Figure 3.25)
Figure 3. 23 Figure 3. 24
Recommended Installation:
Figure 3. 25
Attention：
1) Signals’ reception will be affected if GPS is too near to the main rotor
or Servo; the accuracy of the GPS data computation may decrease
when it is too near to the tail rotor
2) Distance between the external compass and servo should be more
than 20cm, while that between compass and the engine should more
than 30cm.
3) The tail boom must be adopted carbon fiber and nonmagnetic
material (the material will not be absorbed by magnet). The screws
near the compass must be adopted stainless steel. If you are not sure if
the material near the compass is magnetic, you can use the magnet or
the ordinary compass to check.
4) If there are some ferromagnetic materials which the maximum
dimension is x near the compass, the minimal distance between
ferromagnetic materials and the compass should be 2x