Pocket Mariner, developers of Boat Beacon, SeaNav and several other tablet and smartphone sailing apps, now provides Apple Watch functionality. With SeaNav, the navigation program, Apple Watch shows waypoints, cross-track error, ETA and distance. Other screens show AIS targets, a compass and flashlight with night-mode.

Apple Watch functionality comes free with most Pocket Mariner apps; SeaNav for iPhone is $19.99. Read more about how the splash-proof Apple Watch works with Pocket Mariner apps at the Pocket Mariner website.