The routes calculated by Orca are tailored to your boat and to the chart data for your area.
To edit your preferences, open the Main Menu > Settings > Navigation.
These are the elements available to you for tailoring the routes:
Offshore cruising speed - Used to estimate route arrival time. Set to your average cruising speed when offshore and outside restriction zones.
Nearshore cruising speed - Used to estimate route arrival time. Set to your average cruising speed when near shore or inside restriction zones.
Routing height limit - The routing engine will prefer to avoid bridges and cables lower than this value.
Routing depth limit - The routing engine will prefer to avoid areas, rocks, and obstacles shallower than this value.
Routing leeway - Adjust how close to the shore the routing engine prefers to follow.