Lost quadcopter in Tsing Yee last year Nov

Lost quadcopter in Tsing Yee last year Nov

Lost quadcopter in Tsing Yee last year November...

Found out the root cause today...  It was because the GPS+Compass module loosen from the pole in the middle of flight and the direction became 90 to even 180 degree offset and was wrong!!!  I flied always in Alt-Hold mode so it was okay initially, but once after I lost video feed, I panic and switched to Return to Home, {banned} things happened and quad flied away (calculation totally wrong!) and into the sea!!!
         

But at last, I found the real root cause...  Rest In Peace! 

附件

here is google map and osd

dont use this old style gps.stand

你衣家用邊隻gps stand呀？

這是我現在用的，用兩粒 screws fixation.   都是 cuav 送的。cuav 應知道之前一粒 screw 版本有問題，後來改兩粒。