Function geod_inverse 

pub fn geod_inverse(
    g: &mut GeodGeodesic,
    lat1: f64,
    lon1: f64,
    lat2: f64,
    lon2: f64,
    ps12: &mut f64,
    pazi1: &mut f64,
    pazi2: &mut f64,
)

Compute the geodesic inverse between two points