#include <math.h>
#define EARTH_RADIUS (6378137.0)
void function(double lat_in, lon_in, double offset_mtr, double *lat_out, double *lon_out)
{
    double dLat = 0.0;
    double dLon = 0.0;
    if( (lat_out != NULL) && (lon_out != NULL) )
    {
        dLat = (offset_mtr/EARTH_RADIUS);
        dLon = (offset_mtr/(EARTH_RADIUS * cos(M_PI*lat_in/180)));

        (*lat_out) = lat_in + dLat * 180/M_PI;
        (*lon_out) = lon_in + dLon * 180/M_PI;
    }
}