Sygic gps range error correction

Question

i'm using Sygic SDK in my form (.net WinForms) with Gmap.NET to display the map. I have implemented map rotation based on GPS coordinates from Sygic. To rotate the map I create 2-3 vectors from last coordinates, add them and get the angle. The problem arise when u stand on one place, the coordinates are not the same due to GPS range error so the map starts randomly rotating.

I could have fixed that if i had that error value, but i only found HDoP (horizontal dilution of precision) in Sygic documentation and its only the scalar to multiply error. So if coordinates are in error range i don't rotate the map.

Is there any trick to computer error value? Is there different implementation?

Sygic also provides speed within coordinates struct. Should i try to use Speed instead? So do not rotate the map if speed is 0. Don't know if that would be accurate.

Sygic coordinates doc:http://developers.sygic.com/reference/cs/html/class_application_a_p_i_1_1_s_gps_position.html

Thanks

Answer 1

"map rotation based on GPS coordinates from Sygic"

No, ist should not be based on the coordinates, but better by the "course" attribute.

"So if coordinates are in error range i don't rotate the map."

No, better is, you don't rotate the map if the device is standing still. Use the speed attribute for that case.

Sygic also provides speed within coordinates struct. Should i try to use Speed instead? So do not rotate the map if speed is 0. Don't know if that would be accurate.

Yes! but you should use a threshold above 0: So if speed < speedthreshold do not rotate.