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Non-Directional Beacons are all but gone within the United States, but remain prolific across the world due to their low cost and high reliability in remote areas.The FAA developed the Wide Area Augmentation System (WAAS) to improve the accuracy, integrity and availability of GPS signals.In conjunction with GPS, another system called the Wide Area Augmentation System is used as well.GPS provides a very precise, global navigation service, which is unaffected by weather, allowing for point-to-point navigation.Global Positioning System (GPS) is a satellite-based navigation system composed of a network of satellites placed into orbit by the United States Department of Defense (DOD).Heading Indicators, also called a directional gyros, are instruments used to determine aircraft direction to aid the pilot in navigation.Attitude indicators display the orientation of the aircraft with regards to its roll (angle of the wings) and pitch (angle of the nose).Generally, altimeters are configured to show height above sea level (an aviation standard) however, other types of altimeters do exist which can measure other heights, such as height above ground.The altimeter reads the altitude of an aircraft.The airspeed indicator provides the pilot with a means of determining the speed of the aircraft.These instruments enable the pilot to maintain spatial orientation during flight.The core of the instruments in an aircraft center around what is often referred to as "the six-pack".Mid-Continent Instruments and Avionics Basic Six-Pack: