Chimani Acadia National Park — $4.99

Mobile developer Kerry Gallivan of Yarmouth said he was hiking in Acadia National Park with his first generation iPhone when he just wanted more.

“I wanted information about the park, trail maps, events that were going on,” Gallivan said. The idea for his app was born, but it took some time to work out the details. It was released in May 2010 and has had more than 100,000 downloads.

The app uses the mobile phone’s built-in GPS to provide pinpoint accurate hiking and biking trail maps, information about more than 300 points of interest, audio tours, tables to tides, sunrise and sunset, information about ranger-led events and Island Explorer shuttle bus schedules.

It’s available for both Apple’s iOS (iPhone, iPod and iPad) and the Android phones and tablets.

The Maine app has been such a success he’s added similar apps for the Cape Code National Seashore, Cuyahoga Valley National Park in Ohio, Grand Canyon National Park and Yosemite National Park.

He’s already at work on a new version that will incorporate “augmented reality.” Using the phone’s built-in GPS and camera, the app will let users look at their National Park surroundings through the phone’s screen, identifying points of interest.

“So you’ll be able to stand on top of Cadillac Mountain and identify the surroundings,” Gallivan said. “There is so much that can be seen, and there really is no other good way to identify some of those views, down in the valley.”

Sun Journal: “Killer apps: Buff up even your dumb phone with these popular add-ons” (including Chimani apps!)