On Friday 09 March 2007 09:58, Bartlomiej Zdanowski AutoGuard Ltd. wrote: > To get *any* GPS reading device must see 3 satellites but you cannot be
Actually, for a single location fix, you need four. With 3 sources you can still have 2 spots on the surface of the Earth that can match up (some GPS receivers being smart and discarding the 2nd solution based on likelihood is a different story). > You cannot depend on GPS reading to count quite accurate velocity, > acceleration and accurate position. Sorry. Position is a different beast in comparison to velocity and acceleration, here the term accurate and precise start differing quite a bit - you can have a precise reading (let's say 1 cm) and, as strange as it may seam, that does NOT mean that your location is +-1cm from what you read on the display (you can try this with several GPS-es in one place - they will have differeces much higher than their precision). _______________________________________________ OpenMoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
