In order to keep your speed camera POI's really up-to-date, it's better to download them from POI -sites. In those sites, speed camera POI's are, more or less, constantly updated. And you can download only countries you really need and in different format's (i.e. for different navigators).

Also other kind of POI's can be found, based on you interests (gas stations, pharmacies, hospitals etc.)

Using GOOGLE, you can easily find several of them. Here is one (good) example:
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Best Regards,
Team-O