Sun on the water is murder on a dark watch face. The Marathon TSAR WW194007SS-0513 answers that problem with a white Arctic dial, a 41mm stainless steel case and bracelet, and a 300-meter rating, which makes it a natural pick for boaters, beachgoers and anyone who spends long days in strong light.

Reading the time at a glance while you trim a sail or keep an eye on a dive buddy shouldn't require shading the crystal with your hand. On this Tritium Search and Rescue diver, the white dial and bold black hands provide strong contrast even in direct sun, and the sapphire crystal resists the scratches that sand and salt tend to leave on lesser glass. When evening comes, tritium tubes on the markers and hands take over, glowing steadily with no need to soak up light first.

Salt water is no issue either. The brushed 316L steel case and bracelet are made for it, the screw-down crown sits protected between guards, and the oversized unidirectional bezel lets you time a snorkel, a dive or a slow lap around the bay. Swiss ETA F06.115 HeavyDrive quartz keeps everything accurate, with an end-of-life indicator to warn you before the battery runs down.

TSAR WW194007SS-0513 Key Features

• Marathon 41mm Tritium Search and Rescue diver
• Arctic white dial, date at 4:30
• Swiss ETA F06.115 high-torque HeavyDrive quartz
• 30 ATM water resistance
• Sapphire crystal over tritium-lit markers and hands; MaraGlo pip and seconds
• 316L case, roughly 14mm high and 48mm lug-to-lug
• Guarded screw-down crown, 120-click diver's bezel
• Stainless steel bracelet for 20mm lugs

Made for bright days, salt spray and a long weekend on the water.