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Vision-based approaches are a promising method for indoor navigation, but prototyping and evaluating them poses several challenges. These include the effort of realizing the localization component, difficulties in simulating real-world behavior and the interaction between vision-based localization and the user interface. In this paper, we report on initial findings from the development of a tool to support this process. We identify key requirements for such a tool and use an example vision- based system to evaluate a first prototype of the tool.