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Peter Fogg  wrote:

> Isn't it via reference to the location of the
> place you want to get to, and the track between
> them?

What Peter said... Once the vehicle starts moving the GPS (at least all of the 
ones that I've ever used) knows both where it is and its current 
direction/speed - from that it's easy enough to figure out how to get to the 
next waypoint.

--
GregR

--- On Mon, 11/2/09, Peter Fogg  wrote:

> From: Peter Fogg 
> Subject: [NavList 10402] Re: On the integration of location and data
> To: navlist@fer3.com
> Date: Monday, November 2, 2009, 9:45 PM
> 
> 
> 
> Lu wrote:
> 
> 
> While a "traditional" GPS doesn't necessarily
> have or need a built-in
> compass, if one thinks about it for a moment one realizes
> that
> 
> automotive navigational systems DO need a built-in compass.
> � Else if
> you punch in an address while parked, how would they know
> whether or not
> to make the first instruction "make a U-turn?"
> 
> 
> Isn't it via reference to the location of the
> place you want to get to, and the track between
> them?
> 
> > 
> 
> 
> 

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