It doesn't have power when car is off, but you really shouldn't leave the GPS plugged in all the time. Even if your GPS is hidden, a potential thief will see that you have a cord running from your cig plug out to somewhere hidden and know that you have something (ipad, kindle, gps, etc) connected to it.
All true, but obviously, in your garage or any other safe place you can do whatever the heck you want to do since it will not hurt anything. But it also won't charge your phone unless the car is turned on, which would be a very bad idea.
Back to the original question, yes you can keep it plugged in. The car turns the 12 V accessory plug off when the car is off, so no worry about draining down the 12 V battery. As others have said whether you would want to do that is your own decision.
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