What data is essential to include in a route plan for effective navigation?

Including waypoints and the intended speed of the vessel in a route plan is critical for effective navigation. Waypoints serve as specific reference points along the route that help to guide the vessel's course and ensure it remains on track towards the final destination. These designated points can assist in managing the vessel's navigation, especially in areas where the marine environment may have obstacles or hazards.

Intended speed is also a key piece of data because it directly affects the estimated time of arrival (ETA) at each waypoint and the destination. Knowing the speed allows for the planning of fuel consumption, time management, and coordination with ports or other vessels.

By providing a clear roadmap with these elements, the route plan enhances situational awareness and helps ensure safe and efficient passage. In contrast, including only the final destination does not provide sufficient detail for navigational purposes, and while lists of crew members and historical logs have their importance, they do not contribute as directly to the navigation process required for a voyage.