little question about navigation board

[Helge Hafting]

Alfa21 wrote:
> 2010-05-02 at 23:31 Christoph Mair
> 
>>> why to add two more gyroscope sensors (so now we have 4 of them in our FR
>>> O_O)  
>> The Freerunner has two accelerometers, but no gyroscope.
> 
> 
> I tough 2 accels + 1 compas could act as gyros... (not the greek similar of the kebab)
> maybe I have to reopen my physic books ^_^'

Partially so. A compass only gives you *some* of the direction. 
Particularly, the compass won't notice if the device spins around the 
north-south axis. Do it slowly, and the accelerometers may be too 
limited to notice.

Of course, such a movement doesn't normally happen in a car. But
you do want to notice if this happens to your plane . . .

Helge hafting