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Re: May Day and QBI
The pretended QBI origin is wrong, definitely. QBI as an abbreviation is part of the so-called Q groups - a number of 3-letter-codes which were largely in use when airborne radio equipment could not transmit human speech, but only morse code. Some Q-groups are still common today in aviation: QNH is standard pressure, QFE is pressure at a given location, QDM is heading to a radio station, QDR is heading from a station, etc.
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