![]() The position estimation is calculated by manipulating and matching a wireframe overlay of the Earth's coastlines with the images. State Acq, short for State Acquisition, is a navigation experiment that uses a series of photos of Earth, combined with information from the iPhone's three-axis gyroscope and accelerometer, to estimate the spacecraft's latitude and longitude. ![]() Sensor Cal is another program that will use a series of photos of a reference image to help calibrate sensors on board the space station. Limb Tracker is designed to yield an estimate of altitude and the "off axis" angle, which is a measurement of the angle of the image with respect to Earth's center. The first program, called Limb Tracker, is a navigation experiment that involves taking photographs of Earth and matching an arc to the horizon. With Apple's popular smartphone has been certified for spaceflight, and both iPhone 4s will remain on the space station for several months while the experiments are performed. This version is designed to simulate the experience astronauts will have for users on the ground. While intended for space use, a version of the app is also available now for 99 cents in the Apple App Store.
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