Note: This app requires an iPhone with a internal Gyroscope, it needs an iPhone 4, iTouch 4 or iPad 2 or greater to run.
A ship Inclinometer (a.k.a) Tilt Gauge. Uses the internal Gyroscope for incredibly accurate readings!
Also great for leveling paintings in your home (plumb)!
No Calibration needed! Because this uses the Gyroscope, its not like the older apps that needed recalibration for each use. This app is always ready, and always calibrated!