[Loadstone] MTK chipsets

Rob Melchers rob at loadstone-gps.com
Fri Feb 13 01:07:47 GMT 2009

The GreatCircle formula thinks of the planet as a perfect globe, the 
Elipsoid formula takes the earth flattening into account. Pages full can be 
written about this, try Google for more info.


At 2/11/2009, you wrote:
>My question is: What's the difference between great circular and Accurate
>Ellipsoid formulas? Second, Which one is used by LS in calculating
>distance/heading? I guess it's specifically useful while announcing distance
>in auto announce mode and during the approaching announcement.

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