Which of the following items should be included in a float plan?

Including a destination, route, and departure time in a float plan is essential for safety when boating. A float plan serves as a safety net, providing crucial information that can help locate you in case of an emergency. By clearly outlining your intended destination, the specific route you plan to take, and the time you will be leaving, you're giving rescue personnel valuable data to assist in search efforts if you fail to return or encounter problems. This information helps ensure that someone is aware of your travel intentions, which is vital for your safety on the water.

The other options do not provide this level of critical, actionable information necessary for a float plan. For instance, just including the vessel's registration number lacks context regarding your travel intentions. While knowing your favorite fishing spots or having a weather forecast can be useful, they do not replace the foundational safety information that the destination, route, and departure time provide.