It’s not the Actisense USB Gateway itself that is preventing GPX files from being sent to a chart plotter. Neither NMEA 0183 or NMEA 2000 can handle transferring a GPX file. NMEA 0183 provides a way to describe waypoints and routes, but does not really provide a standard way to send one to a chart plotter in a meaningful way and most manufacturers don’t implement it anyway. NMEA 2000 provides a way to ask a device, such as a chart plotter about its collection of routes, but it does not provide a way to send a route to a chart plotter; you would have to have the chart plotter ask Coastal Explorer for a route. But I don’t think anyone has implemented that either. I’m afraid the Nemo Gateway is not going to help transfer routes either, because the problem is really with the chart plotters and the NMEA protocols so there’s nothing any gateway can really do/