Scientific Anglers Sonar Titan Textured Big Water Taper Max Sink. Fast-sinking saltwater fly line for Big Game. - Surf / Black. The SONAR series takes your fly and puts it right in front of the fish. Whether you're throwing streamers for trout, big flies for muskie, or even fishing stillwaters, we have the perfect sinking line for you. Get down, and stay down, with SONAR.