Which moored to a dock what should you do before casting off while you warm up the engine?

Before casting off while warming up the engine, ensure that all lines are untied and securely stowed to prevent them from getting caught in the propeller. Check that fenders are properly positioned to protect the boat from the dock. Additionally, conduct a safety check to ensure all crew members are aboard and that safety equipment is readily accessible. Finally, confirm that the area around the boat is clear of obstacles and other vessels before proceeding.