The precision you get is dependent on time. The longer you use it, the more the error will grow. For a short time (a couple of seconds), the precision can be pretty good, less than 1mm. However, because an IMU has no fixed position reference, integration errors will creep in, and eventually you'll be parsecs off, and travelling at the speed of light.

To get good rotation accuracy, you can add a 3-axis compass. To get good good position accuracy, you need some kind of position reference. Exactly what this is depends on how far you want the device to travel.

If you only want to travel a metre or so, I recommend forgetting about the IMU and using a magnetic trcker like the [miniBIRD][1].

For a longer distance you can use GPS. [1]: http://www.ascension-tech.com/realtime/RTminiBIRD500_800.php

The precision you get is dependent on time. The longer you use it, the more the error will grow. For a short time (a couple of seconds), the precision can be pretty good, less than 1mm. However, because an IMU has no fixed position reference, integration errors will creep in, and eventually you'll be parsecs off, and travelling at the speed of light.

To get good rotation accuracy, you can add a 3-axis compass. To get good good position accuracy, you need some kind of position reference. Exactly what this is depends on how far you want the device to travel.

If you only want to travel a metre or so, I recommend forgetting about the IMU and using a magnetic trcker like the miniBIRD.

For a longer distance you can use GPS.