navigation system error

Hi, First time forum user and still relatively new to Drones having flown only 6 hours; all trouble free. Never crashed or had a harsh landing, fly mostly in the countryside or parks on clear calm days, also flown in urban environment a couple of times no issues. Most recent successful flight...

Hey everyone, I did not find a clue to this in the forum: I had been getting an error message that the downward sensor needed calibration, so today I finally did a full sensor calibration. After that, when I try to power on the drone I get an error message that says "Navigation System Error...