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Last year, Apple released another software product that many regard as half-baked: the voice-controlled virtual assistant Siri. But Siri’s ability to _at least sometimes_ understand spoken queries was something most users hadn’t met before, so they forgave its lapses. With Maps, Apple is replacing an app nearly every smartphone user is already familiar with.

User reaction on social media has been fierce. One Twitter user quipped that the lines of people queuing up to buy the iPhone 5 on Friday will be shorter, because the buyers will be misled by the new Maps.