If you know of someone having a real issue due to K index, please post about it. I feel the K index would need to be so high that it would also affect other electronic devices along with RC aircraft to be an issue.
I agree LuvMyTJ,
I focus on the the K index simply to alert for geomagnetic storms which do affect GPS receivers. Especially in the upper latitudes. My mention of "k index" was automatic and I should have just stuck with "geomagnetic storm" or "G4" to indicate the receiver. Since his problems at first seemed distance related and happened nearly overnight I was focusing on GPS. We design, manufacture and distribute commercial and amateur antennas for the HF, VHF and UHF spectrum and the K index greatly affects the HF band.
Weather wise, Fog, smoke, humidity and folage are far more likely to cause problems in the ISM bands. (2.4gHz and 5.8gHz)
In state emergency management we get constant alerts once a storm or CME reaches 4. I guess I presumed the focus to be on the geomagnetic storm which does affect the GPS receiver.
In any case I hope he replies with what DJI determines.
Lets hope the L1/L5 chip is everything the manufactures hope and we can worry less about GPS.