GR-701W hangs on Pi-3

[Hal Murray]

Has anybody else noticed any problems?

I've seen it a few times.

The symptom is no output.   cat /dev/ttyUSB0 never prints anything.  Neither 
gpsmon i nor gpsd could get it going again.  unplug then replug gets it going 
again.

I haven't seen similar troubles with 601Ws on Pi-B or Pi-2.

I just swapped the 701 on a Pi-3 with a 601 on a Pi-2.

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