"proprietary"? I have 5 Garmins and they all use standard Mini USB or Micro USB.
I have a car Garmin that uses both mini USB (for power in the car) and micro USB (for data).
I think every other manufacturer stopped using mini about a decade before Garmin did.
They're still both pretty common standards. Better than Apple in that regard.
@chez_jay started
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"proprietary"? I have 5 Garmins and they all use standard Mini USB or Micro USB.