Ekos mounts the /dev/ttyUSB0 point for the dongle as can be seen in your image for the mount settings. And it will try to send on it the commands which will fail. The mount will be mounted on /dev/ttyUSB1 since the first port is used, but cannot be used by Ekos.

You must then remove the dongle and the USB cable from the mount to dismantle the dev points.

Systemd looks at the gspd file and first mounts the dongle with USBAUTO. With the value false, we prevent this. And START_DAEMON allows you to launch the gpsd service only on request, for example with Ekos.

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