Lets tackle the former issuer first. National Parks runs on the iPhone, iPod touch, and iPad. Use it on devices with smaller screens, and youll get a competently organized set of facts and figures for 20 national parks. Select a park, and youll see buttons that can give you dynamically updated weather information and forecasts along with stats on how many people visited the park in 2011. Tap around a bit, and you can find basic park information such as how to get there, when to go, and what sites you should make a point of seeing should you visit the park. Other information on entrance fees, accessibility, pets, and other visitor services should also come in handy for planning a trip, as well a page of camping and lodging information. A map tab shows the park with colored pins depicting points of interest, campsites, and photos. (Youll need to tab on an info button to figure out whats what.) Its all very nice looking on an iPhone screen, though not particularly breathtaking.

On an iPad, however, the view is outstanding. National Geographic uses the tablets larger screen to full effect, so that theres less tapping around. The How to Visit and About The Park sections appear on an individual parks main page, and park info, directions, and camping data are accessible in helpful pop-up windows. The Map tab could still use some more helpful labeling on the iPad, but when you select one of the picture pins, the image fills the entire screen of your tablet. Whats sort of so-so on the iPhone becomes very impressive on the iPad.

Each park section gives you the option of downloading a full guide. You get one download for free; the others are available as an in-app purchase for $1 or $2 depending on the park. The downloaded guide really expands on the rather basic information that comes with the app by default. Youll get more extensive write-ups on what to see and do at a particular park, while a Park Secrets section lists 10 interesting facts about Yosemite or the Great Smoky Mountains parks. A Photo Tips section is probably the highlight of the app: Youll get an impressive selection of photos from around a particular park along with info and stats on the shot andperhaps of most interest to amateur shutterbugstips on recreating the image with your own camera. (As with the basic information provided by National Parks, the expanded guide displays more impressively on the iPad than it does in the iPhone.)

National Parks by National Geographic is a worthwhile tool for planning your next visit to a national park, particularly if youre willing to download the individual guides for each park. That said, the app suffers slightly from a limited scope: There are 58 national parks, after all, and this app contains information on not even half of those. I would like to see Carter Lake, Dry Tortugas, and Lassen Volcanic afforded the same treatment that Yellowstone, Glacier, and Acadia currently enjoy. And Im pretty sure other national park enthusiasts and travelers would feel the same.