LNAV( lateral navigation ) & VNAV( vertical navigation)
RNAV is a short form of Area Navigation . LNAV and VNAV are parts of the automatic flight director system(AFDS), and are short form for ' lateral navigation ' and ' Vertical Navigation'. 1.LNAV :is the route you fly over the ground or simply lateral movement of the aircraft w.r.t ground. The plane may be using VORs, GPS, DME, or any combination of the above. As pilot enters his route as specified in the FMS (Flight Management System). The route shows up as a magenta line on the lower flight display, and as long as the autopilot is engaged in the LNAV mode, it will follow that line across the ground. LNAV however does not tell the plane what altitude to fly. 2.VNAV means guidance to the pilot w.r.t to descent or climb or in simple words vertical movement of the aircraft. If you are flying with the autopilot on in VNAV mode at cruise altitude, you can enter what speed you desire to make a descent at, and what altitude you wish to cross a particular point, ...

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