As a quick respite from the discussion of the alphabet-soup of approach procedures, it occurred to me that the LOC approach plate specified that it wasn't available at night if the PAPIs were out. Does that mean it is available if the PAPIs are out during daytime? In which case, how are you supposed to determine the vertical profile in a way that you can't do at night? And what about daytime IMC? Can it be used with the PAPIs out then? As it stands, it seems a bit of a strange limitation.