Editing Morse code (section)

===Aviation===
[[File:VFR Chart Cayo Largo Del Sur VOR-DME.png|thumb|Cayo Largo Del Sur VOR-DME]]
In [[aviation]], pilots use [[radio navigation]] aids. To allow pilots to ensure that the stations they intend to use are serviceable, the stations transmit a set of identification letters (usually a two-to-five-letter version of the station name) in Morse code. Station identification letters are shown on air navigation charts. For example, the [[VHF omnidirectional range|VOR-DME]] based at [[Vilo Acuña Airport]] in [[Cayo Largo del Sur|Cayo Largo del Sur, Cuba]] is identified by "[[call sign|UCL]]", and Morse code '''{{sc|UCL}}''' is repeatedly transmitted on its radio frequency.

In some countries, during periods of maintenance, the facility may instead transmit the signal {{nobr|'''{{sc|TEST}}'''}} ({{nobr|{{Morse|dash}} {{Morse|dot}}{{Morse|dot|dot|dot}}{{Morse|dash}}}}), or the [[call sign|identification]] may be removed, which tells [[Aviator|pilots]] and [[navigator]]s that the station is unreliable. In Canada, the identification is removed entirely to signify the navigation aid is not to be used.<ref name=FAA-2015-Air-Nav/><ref name=Canada-AIM-2003-COM-3-2/>

In the aviation service, Morse is typically sent at a very slow speed of about 5&nbsp;words per minute. In the U.S., pilots do not actually have to know Morse to identify the transmitter because the dot/dash sequence is written out next to the transmitter's symbol on aeronautical charts. Some modern navigation receivers automatically translate the code into displayed letters.[[File:NonDirectional Beacon WG.ogg|thumb|right|The sound of non-directional beacon '''{{sc|WG}}''', on 248&nbsp;kHz, located at 49.8992&nbsp;North, 97.349197&nbsp;West,<ref name=Pilotnav-sps-10404/> near [[Winnipeg James Armstrong Richardson International Airport|Winnipeg's main airport]]]]