def latlon_dm2dd(Mooring_Lat, Mooring_Lon, pos_dir="W"):
    """
    Convert Postitive Latitude or Longitude from degrees and decimal minutes
      to decimal degrees
    """

    lat = float(Mooring_Lat[0]) + float(Mooring_Lat[1]) / 60.0

    lon = float(Mooring_Lon[0]) + float(Mooring_Lon[1]) / 60.0
    if pos_dir == "E":
        lon = -1 * lon

    return (lat, lon)