The Control Instruments display immidiate attitude and power indications and are calibrated to permit those respective adjustments in precise increments. Control is determined by reference to the attitude and power indicators. Power indicators vary with aircraft and may include manifold pressure, tachometer, fuel flow, etc.
The Performance Instruments indicate the aircraft's actual performance. Performance is determined by reference to the altimeter, airspeed, or vertical speed indicator (VSI).
The Navigation Instruments indicate the position of the aircraft in relation to a selected navigation facility or fix. This group of instruments include various types of course indicators, range indicators, glide-slope indicators, and bearing pointers. Newer aircraft with more technologically advanced instrumentation provide blended information, giving the pilot more accurate positional information.
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