Well I think the watch would work well for repeating wind instruments, but not chart plotter. Seems it could be really good for a whole team, especially if you had a watch like display that was perhaps a bit bigger, along the lines of say 3 inches. You could have scrolling instructions as well. Better than shouting, and would not give away your intentions to the competition. Could be good for a husband/wife team during anchoring.I think a smart watch tied into boat instruments looks more useful than Google Glass (and it is probably easier to see in bright sunshine too).