2 4 2 7 252 30NM 0835.4z TRK M ALT 9R 360 FLT WPT08 260 80 CSP SCARR 20 Airplane track to heading ETA Airplane symbol Windspeed Present heading WXR display Procedure turn Runway centerline Marker beacon Waypoint and ID VOR and ID Active flight plan path Curved trend vector Wind direction Range to selected altitude Runway and ID Tuned NAVAID radial Holding pattern Intersection and ID Selected heading vector Selected heading cursor Distance to go VORTAC and ID Vertical deviation pointer Figure 10-116.  An EHSI presents navigational information for the entire flight. The pilot selects the mode most useful for a particular  phase of flight, ranging from navigational planning to instrument approach to landing. The MAP mode is used during most of the flight.  of an operating aircraft beyond human ability while relieving  the pilot of the stress from having to do so. Still, EADI and EHSI technology is very desirable, reducing  workload and panel scan with the added safety provided by  integration of navigation information as described.  Computerized electronic flight instrument systems have  additional benefits. The solid-state nature of the components  increases reliability. Also, microprocessors, data buses, and  LCDs all save space and weight. The following systems  have been developed and utilized on aircraft for a number  of years. New systems and computer architecture are sure  to come in the future.  Early EFIS systems have analog technology, while newer  models may be digital systems. The signal generators receive  information from attitude and navigation equipment. Through  a display controller, the pilot can select the various mode  or screen features wishing to be displayed. Independent  dedicated pilot and copilot systems are normal. A third,  backup symbol generator is available to assume operation  should one of the two primary units fail.  [Figure 10-118] Electronic depiction of ADI and HSI information is the core  purpose of an EFIS system. Its expanded size and capabilities  over traditional gauges allow for integration of even more  flight instrument data. A vertical airspeed scale is typically  displayed just left of the attitude field. This is in the same  relative position as the airspeed indicator in an analog basic  T instrument panel. To the right of the attitude field, many  The flight instruments were the first to adopt computer  technology and utilize flat screen, multifunctional displays  (MFD). EFIS uses dedicated signal generators to drive two  independent displays in the center of the basic T. The attitude  indicator and directional gyro are replaced by cathode ray  tubes (CRT) used to display EADI and EHSI presentations.  These enhanced instruments operate alongside ordinary  mechanic and electric instruments with limited integration.  Electronic Flight Instrument System (EFIS) 10-70