A flexible aircraft fuel gauge is one that can be programmed by the pilot. By powerful we mean it can automatically provide data to your GPS or on-board integrated electronic flight instrument system which in turn can calculate fuel status for a particular flight path or destination.

Difficult to believe but there are many pilots out there that still rely on the old method of calculating fuel use i.e. with a calculator. Flying since before the digital age when aircraft gauges used to be faulty at best, they think the manual way of calculating fuel use is still accurate.

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