Descent Primary Flight Display VOR 
WayMan
JUNE 16, 2025
Vertical Speed Indicator (VSI): Indicates the aircraft’s rate of climb or descent, making it possible to accurately control the vertical flight path. But the extent of avionics is much greater than simple presentation of basic flight information.
Pilot Institute
FEBRUARY 15, 2025
Before RNAV, pilots had to rely on radios (NAVAIDs) and antennas on the ground such as VORs (Very High-Frequency Omnidirectional Range) and NDBs (Non-Directional Beacons). LNAV Approach An LNAV (Lateral Navigation) approach helps guide you left and right toward the runway, but it doesnt tell you how to control your descent.
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