For VFR flight during the day, the following in- struments and equipment are required: (1) Airspeed indicator.(2) Altimeter.(3) Magnetic direction indicator.
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(b) No person may operate a civil aircraft unless the airworthiness certificate required by paragraph (a) of this section or a special flight authorization issued under § 91.715 is displayed at the cabin or cockpit entrance so that it is legible to passengers or crew.
Well, as most of you under the FARs are aware—not to say used to—in the United States it is perfectly legal to fly VFR without any visual contact with the ground. As long as you maintain the minimum VFR requirements regarding visibility and cloud clearances, you are good to go—all you need is a natural horizon.
No person may operate an airplane over-the-top or at night under VFR unless that airplane is equipped with the instruments and equipment required for IFR operations under § 91.205(d) and one electric landing light for night operations. Each required instrument and item of equipment must be in operable condition.
In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.