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All I can do is quote Tom Carden: "So let me get this straight… Inside the beloved and venerable Java OpenStreetMap editor, JOSM, you install a plug-in which runs a (port? emulator?) version of Lotus Turbo Challenge II. And you drive around the game on a level composed of the aerial imagery you were tracing in JOSM. And it records GPX tracks. Which you can trace into maps and share on OpenStreetMap. Jesus."
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"Trails is the first GPS iPhone app that allows you to record, import and export tracks onto your iPhone." Also, it's not *too* battery intensive, has a really well thought-out UI, and wasn't too expensive. Very nice.