Maximum poi categories allowed In Zumo 550?

 

So far I have not been able to find out what the maximum number of categories for poi's are for the Zumo 550.

This has become an issue for me since I downloaded a pair of speed-camera databases for the UK and most of the countries of Europe. Now I want to download some other databases containing the poi locations of various attractions throughout the UK and Europe and I am concerned that I may exceed the poi category limit of the Zumo 550. Any knowledgeable help would be much appreciated.