- LNAV
Lateral Navigation (abbreviated LNAV) in
aviation is a function ofautopilot which directs lateral movement of aircraft either according to pre-programmed FMSflight plan duringclimb , cruise and descent or according toILS localizer during approach.non-precision approach. The approach minimums for LNAV are higher than other types of area navigation (
RNAV ) due to the lack of vertical guidance. Aircraft relying on LNAV instrumentation must descend incrementally rather than following a fixed glide slope down to thedecision height ("DH"). Consequently, the DH for LNAV approaches will, in most cases, be higher than for most LNAV/VNAV approaches. In some cases, though, such as when there is an obstacle close to the runway, LNAV's DH will be lower than in LNAV/VNAV approaches. Aircraft flying an LNAV approach descend directly after passing over an obstacle whereas on flying an LNAV/VNAV approach must continue on its glide slope.ee also
*
RNAV
*VNAV
*Navigation .External links
* [http://web.archive.org/web/20070307223935/http://gps.faa.gov/gpsbasics/lnav-text.htm FAA: LNAV (Lateral Navigation)] (archived version)
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