On 20 Feb 2003 at 3:14, Keith Whaley wrote:

> Navigation systems use gyros that do that, but the inner 'orb' has to
> be 'spun up' (accelerated to some rotational speed) for it to work
> properly. That requires more $ophi$tication and power than I would
> imagine Nikon wants to fuss with.
> 
> MHO,  keith whaley

My guess is that they use simple old mercury switches:

http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=000dg4

Rob Studdert
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