I read somewhere that it beeps until the distance gets to 20cms! then it's a constant pitch.
I think that's a bit useless as if you're going for a tight spot you'll need that extra 20cm's.
Stick to using your eyes, all you need to do is lean back and you can literally see out the back window
Leaning and looking right out the back window would depend on your height. I'm short, however I still do not see the need for the parking control. The car really isn't that big and if you are parking in a space that tight - maybe you should park elsewhere! Wouldn't want the other bloke to dent your bumper when he pulls out now would you?
Having driven lots of MINIs and BMWs, PDC is not essential for an able bodied person (i.e. if you can turn your head). It is so easy to park a MINI, IMHO, the money could be spent better on some other option. However, driving cars such as a BMW 3 series coupe, 5 or 7 series, PDC is a useful aid since the car is relatively long (with a boot/trunk overhang) and it is harder to judge where the rear of the car is.
Martin L is correct in saying that the last few CMs/inches, the beeps change to a continuous tone so that you have to guess this last part if trying to slot in the tightest of spaces. However after a few times, you soon understand how much further you can reverse the car after the continuous tone commences.
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