Morse code in Cayo Largo del Sur, Cuba is coded as "UCL", and UCL in Morse code is transmitted on its radio frequency. In some countries, during periods of maintenance, the facility may radiate a T-E-S-T code () or the code may be removed which tells pilots and navigators that the station is unreliable. In Canada, the identification is removed entirely to signify the navigation aid is not to be used. In the aviation service, Morse is typically sent at a very slow speed of about 5 words per minute. In the U.S., pilots do not actually have to know Morse to
Standard Arabic Technical Transliteration System (ي) and 'alif maksūrah (ى), and it cannot depict an 'alif maddah ( آ ). Satts can also not distinguish between a final seated hamza and a final independent hamza, if the word ends in "AE", "IE", or "WE". The Latin alphabetic letter employed for each Arabic letter in the SATTS system is its Morse-code equivalent. For example, Morse code for the Arabic letter ţā' (ط) is • • — (dit-dit-dah). That same Morse code sequence represents the letter U in the Latin alphabet. Hence the SATTS equivalent for ţā' is U. In the Morse-code era, when Arabic language Morse