This question popped up several times in recent conversations, so I figured I'd put together a quick video...
This briefly explains how to add a waypoint to your Navionics App once given the GPS coordinates. So basically, here's how you create a waypoint from a set of GPS coordinates...
Adding a Waypoint from GPS Coordinates on your Navionics App - CLICK HEREHopefully this helps and eliminates some of the questions.
Enjoy!