Unmenned marine voyage at 600 mile (Sea lion project)

Hi guys, we are creating a hydrographic unmanned boat for scanning large areas.
As part of the demonstration project, an unmanned boat trip from the port of Korsakov to the port of Vladivostok is planned. It’s more than 600 miles.
Some advice on the autopilot settings is required.
At this stage, the boat is completely ready, including the installed telemetry systems, and the autopilot.
Life tests of the boat and autopilot settings are coming.
HEX Pixhawk CUBE BLACK installed as autopilot.