Use this procedure only in case you want to send to Navionics a select GPX track and not all of them, which is recommended because it’s easier and allows us to generate much better SonarChart™ results.
Scroll to Waypoints, routes, tracks and press √
Scroll to Save ... and press √
Scroll to recording track and press Menu
Set Time period to 1 sec and press √
Now press X and start boating (at this point you are recording the trail)