The face of the Rolex DeepSea ($13,000) fades from bright blue to dark black, mirroring the ocean itself.
Garmin's Quatix ($449) has the ability to control your vessel's autopilot and send waypoints to an iPad. It's also glare-proof and water-resistant to 164 feet.
TAG Heuers are popular with actors like Leonardo DiCaprio, but its Aquaracer 500M Calibre 5 ($3,850) was designed by scuba divers. This watch functions to depths of 1,640 feet and sports luminescent hands. TAG Heuer, 866-260-0460; tagheuer.com