Find your way back to the marina by saving the GPS coordinates in the app, can be used as a backup to the chart plotter, the app provides the following features. Course to destination. Distance to destination. ETA to destination (by average trip speed or preset boat speed). Visual arrow which points to the destination, click on the panel to switch between relative bearing and true bearing. Your true course (TC), compass course (CC) and calculated compass error. Digital compass. You can store ta