Marine and inland conditions can change quickly. The National Weather Service warns that weather and wave conditions may change suddenly and identifies winds, thunderstorms, fog, and other rapidly developing hazards as reasons for attention. An operator needs local expertise, current information, and authority to stop or modify operations when conditions are not acceptable.

This guide does not prescribe navigation or weather limits. Those limits should be set by qualified people using the vessel, waterway, local rules, insurance, and operating experience. The focus here is the policy and reservation workflow surrounding a decision.