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Why does the compass seem to work only when I’m moving?

April 26, 2017compass I’m moving

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Why does the compass seem to work only when I’m moving?

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Q1. “Why does the compass seem to work only when I’m moving?” A1. For the iPhone 3G, or the 3GS compass in satellite mode, the compass on the MotionX-Navigation page acquires information from “orderly changes in position”. Steady directional motion improves accuracy. A sustained speed of a few mph or km/h is all that is needed to provide an accurate heading. In satellite mode (which is the only option for the iPhone™ 3G), at slow speeds, heading information is unreliable since it does not use a magnetic compass.