Using this Tissot Seastar 1000 Chronograph is a breeze. Just set the time as you would with any regular watch. The chronograph function can be used to time events, start by pressing the top button to start, the bottom to stop, and the top again to reset. When wearing it for water sports, make sure the screw - down crown and case back are tightly closed to maintain its water - resistance. As for maintenance, keep it away from extreme temperatures and magnetic fields. Wipe it with a soft cloth regularly to keep it clean. If you notice any issues with the movement or water - resistance, it's best to take it to a professional watch repairer.