For pilots, the only benefit without ADS-B-In is that other pilots who do have it will be able to see them. With it there are a number of features that make ADS-B different from -- and in my opinion better than -- other traffic display systems. Some systems don't indicate the direction a target is moving. That works pretty well for targets that are moving quickly enough so their progress across the display is obvious, but for slow-moving targets it may take a couple of anxious moments for the pilot to visualize their direction of travel. Most traffic warning systems have a protected cylinder of airspace, for example 1,000 feet above and 1,000 feet below the host airplane. So, for example, if a target climbs (or descends) into the protected airspace to the right of your course, it's helpful to know if the target is moving to the left, across your flight path, or to the right, away from it. With ADS-B, targets are depicted as an arrowhead-shaped icon with the point aiming in the direction the targets are moving. An option allows the display of a vector arrow based on time intervals of one to 10 minutes of where the target will be. For non-ADS-B targets, the icon appears as a "bullet" symbol.