Looking at the maps for parts of the world there seems to be choices of maps for different areas with different numbers such as Europe on the 1030 series has multiple choices of 9519, 9520, 9521, 9524, 9525, 9574 and 9578. can anyone tell me what the difference is between them, is there a post that explains it?. seems a bit confusing.

I looked on TomTom's website but couldn't find anything there.