Map pin not placing on exact path

[sriselva21-mbrdi]

I am passing lat, long values for map, But the position of the vehicle goes out of the path. I checked with lat & long coordinates in google map, The pin is pointing to path. If i zoom into the map, the vehicle further moves out of the path.

Lat - 48.719744, Long - 8.879752 values i use for mapbox/google.

Is orientation value is mandatory to pass, How to get orientation values from lat & long values.