Garmin GPSMAP 78 2.6-Inch Marine GPS Navigator – waterproof and very capable
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If you are thinking of getting a good navigator for your sailing needs then Garmin is the way to go and specifically their best selling Garmin GPSMAP 78 2.6-Inch Marine GPS Navigator model. 
Aside from being a good and reliable GPS device it is also waterproof and buoyant so you will not have to worry about dropping it in the water (while it’s still not recommended). It has a nice bright display and a receiver that will never fail you either with precision or its amazing scanning capabilities that will help you out a lot.