LNAV

In aviation, LNAV (short for lateral navigation; usually pronounced el-nav) is azimuth navigation without vertical guidance. RNAV approach plates include LNAV as a non-precision instrument approach (NPA). When combined with VNAV the instrument approach, LNAV/VNAV, is referred to as an Approach with Vertical Guidance (APV).[1]

Instrument Approaches

An LNAV approach is flown to a Minimum Descent Altitude, MDA, while an LNAV/VNAV approach is flown to a Decision Altitude, DA. If WAAS becomes unavailable, a GPS or WAAS equipped aircraft can revert to the LNAV MDA using GPS only.[1]:4–24,4–26

gollark: And it'll have to contend with whatever accursed proprietary mess the existing stuff runs.
gollark: Prosthetics are probably better since they'd only need access to some peripheral nerves.
gollark: I would only trust them if they had an entirely ground-up formally-verified software stack and entirely open-source code/firmware/hardware. Which is unlikely given the pressures to make development go as fast as possible.
gollark: Oops, your neural interface's wireless card has a remotely exploitable vulnerability, your memories will now be overwritten with rickrolls.
gollark: Indeed.

See also

References
  1. Instrument Procedures Handbook, FAA-H-8083-16B (PDF). US Dept. of Transportation, FAA Flight Standards Service. 2017. p. 4-26,4-50,G-6.
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