Thanks to Rising Wings Aviation Channel, here is a very interesting video on airplane navigation aids (NAVAIDs) such as VOR (Very high frequency Omnidirectional radio Range), and how to use the OBS (Omni Bearing Selector) knob both on CDI (Course Deviation Indicator), and VOR; DME (Distance Measuring Equipment); VOR/DME; TACAN (Tactical Air Navigation); VOT (VOR Test facility); and VORTAC (co-located VOR & TACAN beacon):


ICAO Air Traffic Radiotelephony – Transmitting Numbers

Here is an audio/video file with transcript about how the numbers must be pronounced according to the ICAO (International Civilian Aviation Organization) standard. This is how aircrew members, and air traffic controllers should transmit the numbers.

CAUTION – There is not any exception for FL 100, and FL 200 according to the ICAO DOC 9432 Radiotelephony Manual, page 19, chapter 2.4.2, as it is pronounced « FLIGHT LEVEL ONE-ZERO-ZERO », and « FLIGHT LEVEL TWO-ZERO-ZERO ».
However, « Flight level one hundred » follows the French DGAC and the British CAA patterns.

Click on this video:


Navigation thanks to Los Angeles VHF omnidirectional range (LAX VOR)