I have a Skoda Octavia that uses the VW group RNS510 infotainment system (known as Columbus in the Skodas).
The newer beta firmware are supposed to offer the ability to import custom POIs via a DB3 database on an SD card however whilst the import works fine the POIs are not displayed. This appears to be an issue with the 3xxx series firmware as technically they are still beta.
With the 2xxx firmware you cannot import a DB3 file off an SD card, however you can create a custom navigation DVD.
I used the fixed camera and school zone POI files in gpx format to create my custom nav disk and updated my maps on the RNS510 HDD. Whilst there is currently no audible alert function for these POIs at least they show up on the maps which is great.
Its a very straight-forward process so if you are considering having a go I would encourage you to do so as its currently the only known method for importing these useful POIs into the navigation unit.