The first action required of a boat operator involved in a boating accident is to immediately stop the vessel at the scene of the accident and check the safety of everyone aboard. The operator must assess if anyone is injured, provide first aid if needed, and call for emergency help immediately if anyone is hurt or missing. Only after ensuring everyone's safety should the operator then proceed with other duties such as moving the boat out of harm's way, exchanging information, and reporting the accident to authorities if required by law. This is essential to prevent further harm and fulfill legal responsibilities.