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.
1 For fly-fishing, try a 9- to 11-ft rod, rated for a 6- to 8-weight line, with matching reel. Use a sinktip or shooting head lines. Stripping baskets help manage line in the surf.  For light bait fishing or when using Carolina rigged grubs, try a 7- to 9-ft rod, with either a spinning or bait casting reel.