I'm developing a utility for my own logging purposes. In reviewing the ADIF standard I notice some fields that seem useful at first but don't apply to every QSO. I'm curious what others think about these fields: time_off - do any contests or awards programs use this field? The only value I can think of is if you want to query your log for the longest QSO or what your average QSO duration is on a certain mode. So it seems to be a personal interest kind of thing. This doesn't really interest me and its just one more thing to enter before saving a QSO record. I'm leaning towards omitting it from my software, but if anyone knows of an award or contest where it is a required field, please say so. rx_pwer - again, this might be interesting data to have. One time I operated portable with only 5w and exchanged with a station using only 3w. It's "neat" to look back on a QSO like that, but otherwise, are there any reasons to capture the contacted stations power? A related question - I assumed I would make the DXCC entity a required field, but I'm curious if anyone knows of other entities (like IOTA or SOTA) that actually are not associated with a DXCC entity? I'm guessing this case is rare if it exists at all, and I will probably still make DXCC entity a required field.