I am going to back up CJunkie and his Junk Science. I know my camera's video will wave away like you blow a bubble out of a child's toy. Eventually, the bubble returns as a perfect sphere or that wave is now readable.
Therefore, the sound or the GPS is taking that data in, but the time or the wave to catch up like Junkie said is I concur with my junk science I can hear with my own eyes.