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 If you are fly-fishing, try a 9- to 11-ft rod, rated for a 6- to 8-weight line, with matching reel and sink-tip or shooting head lines. Stripping baskets help manage line in the surf.  If you are light bait fishing or using Carolina-rigged grubs, try a 7- to 9-ft rod, with either a spinning or bait casting reel.