This is it: You’re finally going to take that family vacation to the Yosemite. Rented RV? Check. Road snacks? Check. Guidebook? Nah.

Instead, you make your way around one of the most incredible national parks in the U.S. with an audio guide from Just Ahead, a new app that turns your smartphone into your tour guide.

Using GPS, the app pinpoints your location on the road and delivers stories about the sights you’re seeing out the window, plus maps and turn-by-turn directions, including suggestions for what to check out around each corner.

The destination guides are produced and narrated by road-seasoned pros--editor Bob Howells has won Society of American Travel Writers awards for adventure reporting twice--and after you download the free app, you can purchase individual guides for $8 to $10. (Just be sure to do so before you hit the road so you can still access the information even if you're offline.)

Just Ahead has you covered for Yosemite, Zion, Cedar Breaks, Bryce Canyon, Joshua Tree and Death Valley so far, and 12 additional park guides--including the Grand Canyon and Yellowstone--will be rolled out by June 30, just in time for that big summer road trip.

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