To select your heading source for the aim line, go to Settings > Chart and scroll down to where it says 'Show aim line'
Orca allows you to select three heading options:
GPS course
Compass
Both of these sources simultaneously
What aim lines do I see on the chart?
The aim lines you see depend on the heading source option you choose
Compass: You see heading. This shows where the bow of your boat is pointed. It is always used when the Compass source is selected.
GPS Course: You see Course Over Ground (COG). This shows the boat's actual direction over the seabed, taking into account currents and wind.
The chosen aim line appears as a solid black line:
What happens if I select Both?
If you select both sources, COG is shown as a solid black line, and Heading as a faded grey line:
