While using the synchronized playback feature in AS Flight Analysis and the Vision 1000 Playback Utility, I am able to review inertial data for all of my Vision 1000 flights; but, I am only able to play back audio and imagery for a couple of flights. Why is this happening?

Due to the large amount of memory space required for imagery and audio data, the Vision 1000 only retains the last four hours of audio and imagery data. Inertial (location) data, however, requires significantly less memory space, so the Vision 1000 retains up to 200 hours of inertial data.