If you are flying anywhere in Central/South America, I strongly recommend a navigational program for the iPad called Air Navigation Pro. This is a very inexpensive and surprisingly good app. It works with most portable GPSs that communicate via Blue Tooth. I used it with Bad Elf GPS Pro. (another great product, by the way). Why is this program so helpful? You have access to ALL ONC charts pretty much for free on their Map Store. It is an amazing resource, and Airport info is fairly accurate. I you use Facebook check them out under Air Navigation Pro News. Their Web site is:

http://www.dixdouze.com/xample/index.php/airnavigation

The advantage of this is that it can be used anywhere in the world! They provide you with access to ONC and many other types of charts from all over the world. For my trip to South America I bought the 3D charts for Colombia, Peru, Chile and Argentina so that I could see terrain in real time should I have to fly in the clouds. While flying visually I checked for accuracy and it was remarkable how accurate it turned out to be.

It was also a God send for making pilot reports because it is designed to show ETA for each of your route waypoints. It would have been a little more complicated using my Garmin 430, but with Air Nav Pro, making pilot reports was a breeze. The program is so versatile and so affordable that I highly recommend it to anybody that flies anywhere in the world.

While at home I use WingX Pro and Foreflight, which are very good products. Their limitation however, is that they are (pretty much) US only products. You can use ForeFlight with a Canadian map subscription. If you fly outside of the US, Air Nav Pro is probably the best and least expensive choice.