Have successfully used mine, once in the cruise (and with the benefit of a window seat) routing BFS-NCE and return. Passes the time nicely, especially if the weather conditions allow a view of the ground. Max Speed recorded was 555mph (not as good as the 697 mentioned above mind you), and best fun of all was as we flew directly over the speed camera locations. Almost constant "pinging" from the satnav as we persisted in exceeding the various 30mph/40mph/50mph speed limits from overhead Folkestone to Blackpool.