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If you're old-school, here is a device I just learned about today (and it should fit into your pack): The Sunsetwheel. It's a sliderule type device, and may take a few minutes to learn how to use...
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If you're old-school, here is a device I just learned about today (and it should fit into your pack): The Sunsetwheel. It's a sliderule type device, and may take a few minutes to learn how to use...