I have an old G295 that won't take the BlueCharts ;-(
But a friend bought the 476C ;-)
I borrowed it for a couple of passages. The unit and the charts
Not sure what help you need. We sailed nav mark to nav mark.
Sit with the book and practice, practice, practice.
Step one is learning
how to adjust for your time zone, datum, standard units (i.e. nautical miles, gallons etc.) and adjust the screen
contrast and brightness.
Step two - Learn how to enter a course. It is basically a sequence of starting with a blank course, entering the first waypoint, entering the second waypoint, etc. Keep it simple at first by entering nav mark to nav mark (built in waypoints) - Later learn to add your own.
The trick is that the menu button brings up different menus depending on what screen
you are on.
Activating the saved trip is next and customizing the view.
I like the compass
dial with 4 text boxes on one screen and the moving map and 8 fields on another screen.
Finally it's learning
to read the various outputs.
The unit is very powerful and takes some time to get the most out of it.