With bad or non existent PSIP data you cannot tune the virtual location (in this case 4) but the presence of PSIP data does not stiop you from tuning the actual location.
In other words you are right about the data being in the stream but i don't think you are right about that preventing you from tuning the actual location.
In other words you are right about the data being in the stream but i don't think you are right about that preventing you from tuning the actual location.