The PGPSW database in certainly the best and most up-to-date one around. As I don't own a smartphone I use my small TomTom ONE to run the database. It provides both visual and an audible beep warning and I can set the distance from the camera that the beep occurs related to the speed giving me plenty of time to slow down without any sharp braking. Mounted at the right-hand end of the screen it works well as a Sat/Nav and I can enter locations easily with a touch screen keyboard with my right-hand.. It's hard wired so comes on whenever the ignition is turned on and there is only a short lead visible from the door trim rubber to the unit.