Possibly the coolest boat accessory on the market, the Garmin Quatix 6 is a wristwatch that connects via NMEA 2000 boat data streaming to any make of MFD utilising this system (which is most of them).

This gives the watch access to sensor information allowing it to display heading, speed, depth, water temperature, waypoint navigation information, wind data and more. You can also display a colour chart, mark and save waypoints, and use Fusion-Link entertainment control to operate your Fusion boat stereo system.
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https://www.mby.com/gear/garmin-quatix-6-smart-watch-gadget-boating-110867