Localizer Performance with Vertical Guidance (LPV).  Provides lateral containment areas comparable to an ILS  localizer and decision heights between those of LNAV/ VNAV approaches and Category I ILS approaches. Approach  procedure minimums that use WAAS to provide Localizer  Performance with Vertical guidance (LPV). WAAS avionics  equipment is required to fly to LPV minimums, which are  published as DA (decision altitude). Navigation function. An autopilot function that allows  you to track the route programmed in the FMS/RNAV or  navigation receiver, such as a VOR radial. Next Generation Radar System. A network of radar  stations operated by the National Weather Service used to  detect precipitation and wind. These data are used to prepare  weather radar products that can be supplied to the cockpit  via a broadcast weather service. NEXRAD.  See Next Generation Radar System. Long range navigation (LORAN).  LOng RAnge Navigation  ground‑based electronic navigation system using hyperbolic  lines of position determined by measuring the difference in  the time of reception of synchronized pulse signals from  fixed transmitters. LORAN‑C and eLORAN operate in the  100–110 kHz frequency band. Enhanced LORAN (eLORAN)  is planned to operate using more stable timing signals and  stations from other chains for greater accuracy than the  current LORAN‑C system. Nonsequencing mode.  The FMS/RNAV navigation mode  that does not automatically sequence between waypoints in  the programmed route. The nonsequencing mode maintains  the current active waypoint indefinitely, and allows the pilot  to specify desired track to or from that waypoint. LPV.  See localizer performance with vertical guidance. LORAN-C.  See long range navigation. Magnetic flux valve.  A type of magnetometer using coils of  wire as the transmitting portion of a synchronous repeating  system, conventionally used to stabilize and correct a slaved  gyroscopic heading (azimuth) indicator by sensing changes  in the earth’s magnetic field. No-further-input prediction. A technique to help pilots  maintain awareness of how advanced avionics systems are  configured, and of the likely future behavior of the aircraft.  No‑further‑input predictions are made by considering what  the aircraft will do if the pilot makes no further entries or  commands. Nuisance alert. A term used to describe a “false alarm”  provided by an avionics system designed to detect surrounding  hazards such as proximate traffic and terrain. OBS mode.  The name for the nonsequencing mode on some  FMS/RNAV units. See nonsequencing mode. Magnetometer.  The device that measures the strength of  the earth’s magnetic field to determine aircraft heading, and  similar to the flux valve in function. MFD.  See multi‑function display. Mode awareness.  The pilot’s ability to monitor how system  settings are configured throughout the flight. Onboard lightning detection systems.  An onboard weather  detection system that senses electrical discharges that suggest  the presence of thunderstorm cells. Onboard weather radar.  An onboard system capable of  detecting significant masses of precipitation. The primary use  of weather radar is to aid the pilot in avoiding thunderstorms  and their associated hazards. Moving map.  A graphical depiction of aircraft position, route  programmed into the FMS/RNAV, surrounding geographical  features, and any other information about the immediate  flight environment such as traffic and weather that may be  available from other avionics systems. Page.  Any one of a collection of information displays that  can appear on the FMS/RNAV unit. Every page has a title  and presents information related to a particular navigation  topic (e.g., airport elevation, runways, communication  frequencies). Pages are usually in divisions called “chapters,”  which group pages of similar information by topic  (e.g., airports, approaches, VORs). Multi-function display (MFD).  A cockpit display capable of  presenting information received from a variety of advanced  avionics systems. Navigation database.  The information stored in the FMS/ RNAV; contains most of the time‑sensitive navigational  information found on en route and procedural charts. PFD.  See primary flight display.  G-4