Navionics Boating: Determining Distance and Heading Between Two Points

In order to find the heading to a particular point on the map, you can use the Distance Tool.

Tap the compass icon in the lower-right corner of the map screen
Position the RED pin on your location or where you want to find the heading FROM
Position the PURPLE pin on the location you want to find the heading TO

Distance and heading are listed in the information bubble.
Tap the compass icon again to exit.