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Pix4d Iphone app not detecting that S1 switch is up


I’m having trouble using Grid Mission on my iphone. All the settings are fine except for the " S1 switch position correct" option which has an X on it. I’m even flying in a place where 12 satellites are recognized.

I’m using a Phantom Vision 2 Model PV330. I have an iPhone 5S. 

It is the same as this problem this man is describing on youtube:

Any troubleshooting suggestions would be appreciated.


Mine does this every now and then.  I just have to toggle the switch back and forth a few times and it will fix it.