Earlier this month, Noel Santillan, an American tourist in Iceland, directed the GPS unit in his rental car to guide him from Keflavik International Airport to a hotel in nearby Reykjavik. Many hours and more than 250 icy miles later, he pulled over in Siglufjordur, a fishing village on the outskirts of the Arctic Circle. Mr. Santillan, a 28-year-old retail marketer from New Jersey, became an unlikely celebrity after Icelandic news media trumpeted his accidental excursion.

Mr. Santillan shouldn’t be blamed for following directions. Siglufjordur has a road called Laugarvegur, the word Mr. Santillan — accurately copying the spelling from his hotel booking confirmation — entered in lieu of Laugavegur, a major thoroughfare in Reykjavik. The real mystery is why he persisted, ignoring road signs indicating that he was driving away from Iceland’s capital. According to this newspaper, Mr. Santillan apparently explained that he was very tired after his flight and had “put his faith in the GPS.”

Faith is a concept that often enters the accounts of GPS-induced mishaps. “It kept saying it would navigate us a road,” said a Japanese tourist in Australia who, while attempting to reach North Stradbroke Island, drove into the Pacific Ocean. A man in West Yorkshire, England, who took his BMW off-road and nearly over a cliff, told authorities that his GPS “kept insisting the path was a road.” In perhaps the most infamous incident, a woman in Belgium asked GPS to take her to a destination less than two hours away. Two days later, she turned up in Croatia.

These episodes naturally inspire incredulity, if not outright mockery. After a couple of Swedes mistakenly followed their GPS to the city of Carpi (when they meant to visit Capri), an Italian tourism official dryly noted to the BBC that “Capri is an island. They did not even wonder why they didn’t cross any bridge or take any boat.” An Upper West Side blogger’s account of the man who interpreted “turn here” to mean onto a stairway in Riverside Park was headlined “GPS, Brain Fail Driver.”