Jul 19, 2011 - Alpine App LLC has announced update to National Park 2.1. The app allows you to record which of the 477 parks you have visited in the US National Park System. You can then see some overview information and then drill into the the facilities web site to plan your trip. You can record the details of the visit including the date, some notes and a photo. Now you can share your list with your friends and family and compare which parks they have visited.