The same innocuous satellites that you use for navigating in your car are sometimes involuntarily used as spacebased walkietalkies.

(also I am aware of the typos at 3m43s, spotted after already rendering and uploading, too bad)

Links:
My website and other social media https://sgcderek.github.io/

Timestamps:
00:00 Intro
00:33 SARSAT overview
04:40 NOAA
06:33 BeiDou
11:25 Galileo
13:57 Glonass
15:09 GPS
19:03 ElektroL
20:23 Insat3
21:02 Outro