A primary flight display, like the Avidyne Entegra, displays a lot of the numbers we need to conduct a reliable and professional flight. Other PFD's may be configured to display even more of them, perhaps to the point of distraction and clutter, but there are some basic values to which we need ready access at all times during a flight, even when simply going around the traffic pattern. It's best to know them before takeoff.
Aviation is a numbers-oriented activity. Sure; we can more or less safely operate an aircraft by disregarding some of them, but if we intend to aviate with some degree of reliability and repeatability—not to mention professionalism—we need to do it precisely, which means using some metric against which to measure our performance and the airplane’s. […]
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