> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/tracker-650/general-usage/setting-speed-of-sound.md).

# Setting Speed of Sound

Speed of sound should only be changed if you are sure you know what the speed of sound is in your operating environment. It affects how the Tracker 650 calculates the Doppler shift and hence the measured velocities.