I think you have to load the poi files into the POI file of the gps, then use the GPS loader? to Install them so the GPS can use them.
Its a little fiddlly at first but seems to work.
I just uploaded POI speed cameras and some of them come up in my favorites is this correct and do I have to delete them out of this folder.
This is due to using the transfer option in mapsource, yes it will put them in favourites. You need to go to My Data on the gps and delete those enteries then connect your gps to the data chord, open poi loader and locate the poi file on your computerand then let it transfer the file to your gps. It converts it to .gpi format at the same time.