MapQuest becomes the top free iPhone app on the App Store in Canada and fourth on the US App Store after refusing to change Lake Ontario to Lake America (Joe Rossignol/MacRumors)

MapQuest rose to the number-one free iPhone app on Canada’s App Store and to fourth place in the United States after the company declined a request to rename “Lake Ontario” to “Lake America” in its mapping data. The decision sparked user discussion and boosted the app’s visibility, propelling it ahead of competitors in both markets.