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.
The main difference between fly fishing and spin or bait fishing is that in fly fishing the weight of the line carries the hook through the air, whereas in spin and bait fishing the weight of the lure or sinker at the end of the monofilament or braided line gives casting distance.