If you follow the comments on the yahoo site, you will see that the greatest benefit is being able to cover a wide area on each side of the boat along with getting a good idea is what is in the water column. Once an interesting object is shown, all you do is move your curser to it and save it as a waypoint to return to it. It will allow you to check a larger area faster and get an idea of what is down there. Once an interesting spot is marked, you then use the vertical beam to stay on it just like a regular sonar unit. With a regular vertical sonar beam, you are limited to what is directly under the boat and only as much area as the width of the cone at a particular depth-that may be only about 1/2 the size of your boat.