int calculateBVector(float year, float lat, float lon, float alt, float *beast, float *bnorth, float *bdown, float *babs,char *dataPath);
int igrf_bvector_(float *flat, float *flon, float *fyear, float *falt, float *lshell, int *flag, float *beast, float *bnorth, float *bdown, float *babs,char *dataPath);
