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On Sat, 04 Jan 2020 00:03:29 -0500,
wrote:

On Fri, 03 Jan 2020 15:54:05 -0500, wrote:

On Fri, 3 Jan 2020 11:05:50 -0800 (PST), Tim
wrote:

- show quoted text -
I saw that the Navy is going back to teaching celestial navigation to
their crews so somebody must think it is important. I suppose someone
pointed out the GPS satellites might only last a couple days in a real
war.
.........
I’d heard Morse code is coming back too. Even for military pilots. I’d think it’s a good deal

I bet "flashing light" could still be handy in this age of stealth
ships. You light yourself up as soon as you key a mike.
I bet they also have a laser high speed link they can establish
between ships. There is no hardware reason not to. Sampling the stable
element signal from the fire control system along with a feedback
loop, would allow you to keep the laser on target in the roughest
seas.

===

It's entirely possible but probably secret if it exists. I'd use an
infrared laser that would be invisible to the human eye.

The idea of light based data channels is no secret. They just have not
gained as wide acceptance as 2.4gz. The potential bandwidth is
actually greater and they do use IR. I agree I don't remember hearing
about the Navy using it but it seems too good to ignore.