7.25 Automatic Speech Recognition (ASR)
ASR allows the pilot to interact with the GMA and GTN via voice commands.
Commands are constructed around the "Verb – Noun – (Suffix)" syntax for most
ASR commands.
"SHOW" Commands – Used to show pages or data fields on the GTN
"SAY" Commands – Used to instruct the ASR engine to say certain
phrases related to the flight
"TUNE" Commands – Used to tune certain frequencies into the
standby position of the ASR GTN (usually GTN #1)
The "Page" suffix is used in conjunction with the "Show" phrase to command
pages to be displayed on the GTN. (e.g.- "Show Main Map Page")
Audio Panel commands are available to switch audio sources.
"SELECT" to choose which radio the MIC will be selected
"TOGGLE" to toggle the monitor of a specific NAV/COM radio
"DISTRIBUTE" to change the source of audio for the respective seat
positions
"MUTE" to mute audio inputs on the audio panel for the respective
seat positions
Supplemental commands that allow map zooming, and page navigation are also
available.
"BACK"
"CANCEL"
"ZOOM IN"
"ZOOM OUT"
Each command is initiated via the Push-to-Command (PTC) switch. Aural tones
will indicate to the pilot the status of the command. A positive tone (low to high)
will indicate the system executed a command. A negative tone (high to low) will
indicate the system did not understand the command or could not execute due to
system state or configuration. "SAY" commands do not provide aural tones as
feedback.
The pilot must maintain vigilance regarding ASR command information. Due to
the nature of voice recognition, there are times when ASR will interpret a
command differently than the pilot intended. The pilot should always cross
check the ASR response to the information contained within the GTN as
appropriate to ensure in-flight information is accurately understood. If a conflict
exists between information gathered via ASR and that available in the GTN
system, the pilot should defer to the GTN system information.
AFMS, Garmin GTN GPS/SBAS System
190-01007-A2 Rev. 6
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