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I was not saying NBN will be wrong, but that there is no reason in many cases the maps will be comprehensive or often even vaguely so. You also have to remember that even in these days of mass electronic communications, specialists still have to ensure the data is accurate (no mean task) and even more to the point, the data have to be digitised and validated. Can you imagine how long it takes to accurately digitise and then check for errors the vast amount of paper records which exist. Even if you ignored older data and just looked at new data, and assume that all this is already digitised (which will not be true), look at the relatively small numbers of people out there who are regularly recording a group, the need to ensure the data quality is checked and accurate, and that the data doesn't just comprise records of a few easily recognisable species.

I would hope that this website provides a good resource for people with a general interest in what they see around them, for a lot of groups. All this entails huge effort on the part of a lot of people, all done voluntarily, and people should not expect miracles.