The app is designed to let you know what the cable channel is airing, and you can certainly browse the schedule. But there is no search option, so finding what you want to watch is a festival of fruitless finger flicking. Not very helpful really.
Then there is a button marked video. Sounds good to me. Tap it and you get a list of videos, like 'Finding the Titanic.' Sounds interesting. Tap it and you are taken to a page that says video 'not available on mobile.' What!!? I tried them all. How many videos played? Not a one. This is a pretty incredible mistake for an app that advertises video. There is even a 'Safari' button, so I thought I could tap that and play the videos in Safari. Not a chance.
There is a blog button, and I read behind the scenes stories about the programs that are so hard to find in the schedule. Some were interesting, and there were some pictures, but you'd think an organization known for some of the most beautiful photography in the world could display some of that in an iPhone app. No, actually, the pictures selected are rather mundane.