code: def distance_from(self, lat, lon):
          '''get distance from a point'''
          lat1 = self.pkt['I105']['Lat']['val']
          lon1 = self.pkt['I105']['Lon']['val']
          return mp_util.gps_distance(lat1, lon1, lat, lonf distance_from(self, lat, lon):
          '''get distance from a point'''
          lat1 = self.pkt['I105']['Lat']['val']
          lon1 = self.pkt['I105']['Lon']['val']
          return mp_util.gps_distance(lat1, lon1, lat, lon)
docs: get distance from a point