Those less familiar with the terminology generally don't fly aeroplanes. Indicated air speed is different from true air speed and ground speed, but this is es

Those less familiar with the terminology generally don't fly aeroplanes. Indicated air speed is different from true air speed and ground speed, but this is essential complexity - pilots need to know it. Indicated air speed is determined by measuring pressure in the pitot tube (https://en.wikipedia.org/wiki/Pitot_tube https://en.wikipedia.org/wiki/Pitot_tube) and is shown on the air speed indicator, which on an A330 is on the Primary Flight Display (https://en.wikipedia.org/wiki/Primary_flight_display https://en.wikipedia.org/wiki/Primary_flight_display). Important speeds such as stall speed (https://en.wikipedia.org/wiki/Stall_(fluid_mechanics)#Speed https://en.wikipedia.org/wiki/Stall_(fluid_mechanics)#Speed) and never exceed speed have constant values of indicated air speed. True air speed can be calculated if you know the air pressure, which depends on the altitude and outside air temperature. Altimeters work by measuring air pressure. It's a good idea when reporting something to take into account the readership, and to a lay audience explain things which are counter-intuitive.