thanks, 1. did the change to AMC0 as suggested 2. removed gps from pi 3. re-connected gps to USB HUB 4 run cgps -s and there was NMEA data/fix immediately 5. rebooted pi and gps does not work in lsusb output, only the hub is visible but NOT any peripherals connected to it. so [GPS]----[RPi3-usb] wor...