Can't come from permanent. It's a stealth box with no Off switch.
So's mine. I've left my car sitting for days at a time (long weekends and such) and the GPS hasn't yet drained my battery.

I suppose it could come from ignition switched, but I'd then have to fuse it.
Don't understand. Your ignition switched power should already be fused. Just connect at a point after the fuse.
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Tony Fabris