The 3 axis magnetic compass built into the SK GPS is sensitive to some of the magnetic components on helicopters. Specifically, the
SK GPS should be mounted at least:
• 10cm (4”) from ESCs
• 15cm (6”) from motors
• 5cm (2”) from servos
The cable for the GPS should also be at least 3cm (1”) from motor or battery wires, and should be at least 1cm (0.5”) from servo
wiring. It is OK for the GPS wire to cross servo wiring at 90 degrees.
When mounting the GPS unit, it may help to watch the Magnetic Field Strength display on the GPS form in the setup software. Aim
for a mounting location with a field strength under 2. Note that often bolts can be strongly magnetized, so replacing them with
stainless steel bolts may help.
The location of the GPS unit’s magnetic sensor is shown in the image on the left, on the
upper right corner of the unit. The sensor itself is on the underside of the circuit board.
The metal ring included with the GPS cable is a ferrite bead, not a magnet. This ring
reduces high frequency electronic noise. Other tips for reducing EMF and electronic noise
include:
• If cables have to cross, they should cross at 90°
• Don’t run ESC or main battery wires near servo cables, the SK GPS, or its cable
• Don’t run any other wire in parallel with the GPS cable
• Avoid mounting near magnets or bolts (any steel bolt can be considered a magnet)
