![]() Many FMS systems in large aircraft are linked to an Inertial Navigation Unit (often called an Inertial Reference System, or IRS), which is comprised of lasers and gyros that determine aircraft flight path, altitude, and attitude. ![]() While most FMS systems use GPS, that's not their only source of information. During flight, the FMS provides precise guidance between each pair of waypoints, along with real-time information about aircraft course, groundspeed, distance, estimated time between waypoints, fuel consumed, and fuel/flight time remaining. If waypoints and procedures are included in the navigation database, the computer calculates the distances and courses between all waypoints in the route. For this to work, however, you needed to remain within the coverage limits of the VOR and DME.įlight Management Systems (FMS), which are typically found on business and airline jets, allow you to enter a series of waypoints and instrument procedures that define a flight route. ![]() Creating a direct route could shave off substantial mileage compared to victor airways, which relies on routes between NAVAIDs. Each "waypoint" of the course had an associated radial and DME from the VOR being used. Unlike a standard VOR instrument, a full-scale deflection on the CLC-60 was 2 miles, whether you were 1 mile from the station or 50 miles from the station.Īn RNAV route could be utilized by inputting a series of VOR Radials and DMEs to make a navigable course. To use the CLC-60, two knobs controlled "radial" and "distance." If you wanted to "move" the VOR station 12 miles out on the 180 radial (this is just like creating a waypoint 12 miles to the South of a VOR), you'd set "180" in the radial window and "12" in the distance window. This course line computer analyzed information from previously-installed VOR and DME receivers. The first RNAV en-route charts were published in 1968 when Narco introduced their CLC-60 RNAV computer to the market. Boldmethod RNAV Routes Have Been Around Since The 1970s
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