Here is a scary clip from Yesterday. Moments of horror I lost GPS in the air. What happened ? check it out to find out. Why it happened - we still don't know. It wasn't bad cable connection, when it happenes OSD writes "No GPS detected". It was surely a block of some kind.
What do you think could cause this kinf of block ? Even the GSM GPS tracker didn't work.
GPS lost in the air
View this video on YouTube