The Humminbird Fishfinder 515 offers many of the things you need to be a successful fisherman. It offers a great overall package of features that allow you to see what's happening below your boat, to react to it and to bring home your fish each time you set out on the water. Imagine being able to tell your friends about the huge fish you caught or being able to walk through the door with a cooler full of your favorite catch! The Humminbird Fishfinder 515 allows you to do just that. Here are some of the features that make it so great. The Humminbird Fishfinder 515 allows you to see what is happening below the surface of the water. You can do this with this high definition four inch screen. It is a good size to see clearly what you need to. But, what does it show you? It uses Real Time Sonar to capture an image of what's happening below. This is a very powerful sonar signal that delivers images up to 40 times a second! That means you have virtually a live picture of the water and floor. Why use this? Simple. You get high quality shots that you can use to locate the fish, see where it's heading and to know where to place your line. But, that is not all you get with the 515. In fact, to make your image even better, you get something called the Sonar Echo Enhancement. This is an excellent feature. When tested, it can show a tiny BB pellet 40 feet below the surface! So, what does this do for your fishing experience? You can see your bait when vertical jigging. Yes, you can see your bait and see the fish react to it! Imagine seeing your bait luring in your fish and then seeing him get hooked! Excellent. With the Humminbird 515's ease of use, (it features a quick disconnect with no cables to deal with) and its great, high quality features, it is a perfect tool for the fisherman no matter if you are a professional or a beginner. You will love how much help it can give you and the excitement it can add to your next fishing trip.