Scientific Anglers Sonar Titan Full Intermediate Fly LineScientific Anglers Sonar Titan Full Intermediate Fly Line, With a name like Titan, this line promises big things. Luckily, it does more than deliver. The SONAR Titan Full Intermediate fly line is designed to manhandle even the largest flies, and with its intermediate density, it allows you to fish your most heinous flies just below the surface. Right where they need to be. Excellent turnover due to short, powerful head Slow sink rate gets flies just