To: antidemoncrat
You can’t hear a mountain on passive sonar...
21 posted on
11/02/2021 1:31:28 PM PDT by
Little Ray
(Civilization runs on a narrow margin. What sustains it is not magic, but hard work. )
To: Little Ray
If you can’t use active sonar because of your location you better have a real good inertial navigation system or you might run into a mountain.
53 posted on
11/02/2021 2:14:41 PM PDT by
antidemoncrat
(somRead more at: https://economicti Astronomers see white dwarf 'switch on and off' for first time)
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