There are 3 popular ways of adding camera alerts to your tomtom ,you can
1 ) use the pgps files (hard to get last ones were jan 2009 uploaded here on bitsoup),which are basically poi files comprised of a bitmap image and an ov2 data file. all you do with them is copy them into your map and then in your tt's preferences use show poi and add warning for an alert. updating them is a done by deleting the existing files you have and replacing them with a newer download...
2)use the tt cams which comprise an ov2 data file and a ver file which tells you how old the files are for each country.You can just add them to your map and then rerun runmefordct as if you were cracking your map again by selecting 1 or 2 depending on what navcore you're using followed by 2 for at your tomtom. (you'll need to have the blowfish codes for the cameras in your meta thats in your progs folder,it should allready be there if its fairly recent)
To set the warning options with these you need to use the ttcameras option from the main menu on your tomtom.
3 } best way drop em in your map dir and run the alberts easy tool it will create the dct for them
Sometimes the camera menu doesnt appear or it is greyed out but if home is working correctly the option is present on operate my tomtom using the emulator.
To update these just replace the ov2 and ver files with new ones leaving the dct you previously created as it is (theres no need to use the keygen again this way)