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zman posted a topic in EasyGPSI have a Garmin GPSMAP 176C chart plotting receiver unit. I have a “.gpx” file from a friend that recorded waypoints going through a channel area. I can open the file with no problem using your EasyGPS app. However, when I attempt to send the file to my GPSMAP 176C (through the Garmin interface cable and serial port on my laptop), I constantly get a “GPS Error” message as follows: “This program received data it could not understand. Make sure your GPS receiver’s interface mode is set to GARMIN or HOST WAITING. NEMA output should be turned off”. Click Help for further assistance. I initially set the “Serial Data Format” to “Garmin Data Transfer” and set “Transfer Mode” to “Request Waypoints”. The waypoints do not download to my GPS. The message at the bottom of the GPS screen states “receiving waypoints”, but no waypoints are received. I have tried various settings on the Interface Tab section from the instruction manual, but I cannot successfully “Send” the “.gpx” file to the GPS device using your “EasyGPS” app. Is there something I’m missing? Are there other setup parameters on my Garmin GPSMAP 176C chart plotter that I am missing? Thank you! - Gary