Whether we want to admit it or not, human flight by reference to instruments alone is an unnatural act. To determine up from down or left from right without a natural horizon, we need hours of training, and even more hours of regular practice. We also need a decently equipped airplane, stuffed with radios, colorful moving maps, some gyroscopes or their electronic equivalent, and more than a few charts, telling us where to go and how to get there.
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