Wondering where to start when looking for boat navigation units? You aren't alone. Choosing the right marine GPS can sometimes be tricky. Many of us have bought navigation units and ended up needing new ones sooner rather than later. For one, pay special attention to the amount of satellites used for a navigation unit. A good rule of thumb is that the best fish finders utilize at least 12 satellites. Another feature that’s often downplayed before purchase is the size of your screen. Remember that a larger screen will allow you to read a marine GPS unit much more clearly. ReelTrail.com is the marketplace for outdoor enthusiasts to buy and sell new, used, vintage, and handmade gear online. Welcome to the ultimate website for outdoor gear and adventures.