It was updated through (and including) version 3.1.3 (release date February 2, 2010). The first generation iPod Touch and iPhone have iPhone OS 3.1.3 as their newest available version. All iOS versions from 3.2 until 4.0 were made specifically for the iPad.
What do you need? What are the bare essentials you need to get started in fly fishing? Well, you need that basic rod, reel, and line outfit in one form or another. You need a rod, you need a reel, you need a line, and you need a leader.
This fly reel backing is also great for warm water fish such as bass, pike and musky. Fly line backing is a critical piece of gear on your fly reel. It helps you reel in line faster, because it takes up the extra space. It also gives you the added protection from large fish pulling out all of your fly fishing line.