An anonymous reader writes: Hi guys, I am interested in making an inertial navigation system using the now common embedded accelerometers. The problem is, I can't find any specs on what the sensitivity or accuracy of those sensors are. What kind of accuracy should I expect out of one of the laptop embedded accelerometers, and how much out of one of the embedded systems like Gumstix that cost a few hundred dollars? I will probably be using it in a car, if you need to know the operating enviroment. Horizontal X and Y axis required, vertical axis optional.