When you take a look at the list of features that Humminbird 798c SI Combo 5-Inch Waterproof Marine GPS has, you will be as surprised and amazed as we were when we saw this amazing device for the first time.
It is a professional device, capable of giving you the best navigation that you can get for a reasonable amount of money and it even throws a nice fish finding extra that is definitely going to help you out when you get stuck looking for hot spots with fish.
If you decide to get a Garmin GPSMAP 640 Waterproof Car/Marine GPS then you can go literally anywhere in your car or in your boat because it is going to give you the ability to get around without worrying if you are going to get lost.
Big screen and a nice chartplotter are going to make sure that you get a good view of the area you are in and a nice way to get to your destination without worrying if you will get lost on the way to there.
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.
Although it seems like another marine GPS device, Garmin GPSMAP 541s 5-Inch Waterproof Marine GPS is much more than that. Aside from a nice screen on which you will be able to see the map of the area you are in, there is also a nice extra to the whole package.
It is also a pretty reliable chartplotter that will help you navigate through the waters and the sounder that is in there is also something that will make your fishing trips much easier as it will show you the hot spots.