Do you mean that there are no POIs set up at the point where there are cameras, or do you mean that the symbol is there on the map, but there is no warning sound?
If the latter, then you need to make sure that the Safety Camera category of POI, is both enabled and that warnings are set up for that POI category. You do this through the change preferences> Manage POI setting.
Hope I've understood your problem correctly.
Graham |