Does exactly as described which I don't think is true of other companies. Use this cable for Garman Zummo 396 LMT. I mean we bought it so I could plug it in and charge it at home and wirelessly update what it does. I've tried other cables and there were messages on the navigation screen trying to load or download something in a not very specific way, but I also transfer data with this cable and it works great, but it also only charges it from an outlet .
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