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JHello all, how do you do. I’ve repeatedly been asked to talk about Lateral Navigation (LNAV), and Vertical Navigation procedures and sequence on the Boeing 747-400 air the Boeing 747-8. To put it simply, before departure, part of the preparation by the pilots ( While passengers are checking in etc), is to insert the planned route in the Flight Management system. In doing this, the pilots pre-programme the lateral route and also give instructions as to how high and when the aircraft should climb on the route. The Lateral Navigation engages at 50 feet after lift off while the Vertical Navigation engages at 400 feet. The required altitude is pre-selected on the MCP ( Mode Control Panel) and any other en- route climbs or descents too. Have a watch and I hope you will have some idea what LNAV and VNAV are and how they work. By the way, the landing gear is down so that i could slow the rate of climb giving me time to explain the events at a slower pace as they happened.So in summary, LNAV is left-right while VNAV is Up-Down. Hope you like it. Later!😀✈️✈️✈️✈️