def parse_cimis_coordinate_str(coord_str: str) -> float:
    """Parses the coordinate string format used by CIMIS.

    Args:
        coord_str: Coordinate string in the format 'HMS / DD'.

    Returns:
        float: The coordinate in decimal degrees.
    """
    [hms, dd] = coord_str.split('/')
    return float(dd)