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Birdwatchers in Scandinavia don’t want to miss a trick. They are using cellphones equipped with a GPS satellite positioning receiver to help fellow twitchers dash to the sites where rare birds have been spotted. When a member spies an interesting bird, they send a text message describing it, complete with the GPS coordinates. The text is automatically posted on a Web page and forwarded to the phone or email address of every twitcher who has registered. Subscribers with GPS-enabled phones can view a small map, pinpointing the spot, others can get direction from the websites. If it takes off, the system will be rolled out to…