Believe it or not, there was a time when I wouldn't set out on a trip without lugging along one or more of the ungainly objects known as travel books. Today, like so many other quaint antiquities, they've been replaced by my smartphone. Travel-related apps can do so many things that paper can't. They use GPS to pinpoint your location; they play audio and video; they pluck timely information from the Internet rather than become increasingly out of date.
These essential apps are available for both iPhone and Android handsets and offer at least basic functionality for free, though you should...
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