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The site offline
In the national parks, the signal often drops as soon as you drive in. Download the states, road trips and guides you care about here: you can then read them without a connection, on the road or on the plane. Photos are saved in a lighter version to spare your phone's storage.
Install the site on your phone
The site then opens like an app, from your home screen.
On iPhone and iPad, in Safari: tap the Share button, then “Add to Home Screen”.
Some downloaded content has changed on the site since.