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The literature on information visualization establishes the usability of interfaces with an overview of the information space, but for zoomable user interfaces, results are mixed. We compare zoomable user interfaces with and without an overview to understand the navigation patterns and usability of these interfaces. Thirty-two subjects solved navigation and browsing tasks on two maps. We found no difference between interfaces in subjects' ability to solve tasks correctly. Eighty percent of thedoi:10.1145/586081.586086 fatcat:migqheoyjjdjjpg6blnqbpfjky