code: func (s *SpheroDriver) ReadLocator() []int16 {
  	buf := s.getSyncResponse(s.craftPacket([]uint8{}, 0x02, 0x15))
  	if len(buf) == 16 {
  		vals := make([]int16, 5)
  		_ = binary.Read(bytes.NewReader(buf[5:15]), binary.BigEndian, &vals)
  		return vals
  	}
  	return []int16{}
  }
docs: // ReadLocator reads Sphero's current position (X,Y), component velocities and SOG (speed over ground).