Well I've just managed to flash the headlights! There is a delay of a few minutes before the lights flash. It might be quite cool if you were hiking at night and your car was parked on a hilltop in the distance, but otherwise I cannot think of any practical use.
There is no option to sound the horn.
I get "vehicle position unknown". Not very helpful!
There is a lock/unlock feature which I haven't tried, and probably won't.
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