Calculate NUCv, Navigation Uncertainty Category - Velocity (ADS-B version 1)

    Args:
        msg (string): 28 bytes hexadecimal message string,

    Returns:
        int or string: 95% Horizontal Velocity Error
        int or string: 95% Vertical Velocity Error

def nuc_v(msg):
    """Calculate NUCv, Navigation Uncertainty Category - Velocity (ADS-B version 1)

    Args:
        msg (string): 28 bytes hexadecimal message string,

    Returns:
        int or string: 95% Horizontal Velocity Error
        int or string: 95% Vertical Velocity Error
    """
    tc = typecode(msg)

    if tc != 19:
        raise RuntimeError("%s: Not an airborne velocity message, expecting TC = 19" % msg)


    msgbin = common.hex2bin(msg)
    NUCv = common.bin2int(msgbin[42:45])

    try:
        HVE = uncertainty.NUCv[NUCv]['HVE']
        VVE = uncertainty.NUCv[NUCv]['VVE']
    except KeyError:
        HVE, VVE = uncertainty.NA, uncertainty.NA

    return HVE, VVE