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.
You'll see scores of different fly fishing knots, but for most fishing you need only two - one to tie the fly to the leader and another to tie the two pieces of leader material together. To tie a fly to your leader for trout, bass, and pan fish, the easiest knot to use is the clinch knot, and it's one of the best.