Definition
Vertical navigation data shown on an instrument approach chart that supports a stabilized, constant-rate descent from an initial fix down to the runway. It typically includes a recommended descent angle, a visual descent point, and a table of descent rates needed to maintain that angle at various groundspeeds. On non-precision approaches, this information is advisory — it helps the pilot fly a smooth descent profile rather than a series of step-downs, but it does not replace the published minimum altitudes.
Plain English
Extra numbers printed on an approach chart that help the pilot plan a steady descent to the runway instead of dropping down in steps. They show the descent angle, where the descent should begin, and how fast to come down at different speeds.
Context Anchor
Seen on instrument procedure charts and in discussions of vertical navigation, especially when planning a descent path on an instrument approach, arrival, or departure.
Derivation
VNAV stands for vertical navigation — guidance in the vertical (up-and-down) plane, as opposed to lateral navigation (LNAV), which is side-to-side. The 'planning' part signals that the data is provided to help the pilot plan the descent before flying it.
Why Pilots Care
It allows precise descent management that meets restrictions, reduces workload, and produces a stable final approach.
Grounding Statement
VNAV planning information helps shape the descent path, while the published altitude restrictions remain the boundaries the pilot must not cross early.
Intuition Check
Do not read “planning information” as “cleared to descend on this path.” It means “use these numbers to plan or monitor the vertical path while still obeying each published altitude limit.”
Example Sentence 1
Before starting the approach, the pilot reviewed the VNAV planning information on the chart to determine the descent angle and the rate of descent needed for their groundspeed.
Example Sentence 2
Reviewing the VNAV planning information confirmed the descent angle would keep the airplane on the proper path to the runway.