gyroscope

Then they switch to their gyroscope to guide themselves in.

This could be very useful, but it doesn't install on a 3GS because it requires a gyroscope?

Is there an option to have it mounted inside of a massive gyroscope and suspended above a bottomless pit?

Instagram is sniffing the gyroscope sensor data on the phone so it doesn't have to do all that expensive image processing.

Instagram's app needs data from a gyroscope, so if you exported the video or you filmed it on a camera without a gyroscope, you're out of luck.

And you might be able to create a similar motion map using the gyroscope data that the folks at Microsoft create through their image processing techniques!

Microsoft's approach analyzes the content of individual frames to model the camera's position and rotation in 3D space while Instagram uses the iPhone's gyroscope.

I remember reading a while back about a researcher who was working on developing tiny optical gyroscopes that were ridiculously precise, the idea being that you can calibrate their position once and after that all future locations are determined simply by integrating the acceleration of the gyroscope.

Turns out that there's a special type of gyroscope, the Ring Laser Gyroscope, which uses relativity and interference patterns to achieve ~0 drift.