OT: OT: China switches off AIS

Nop, they have their own version of AIS. They see you, but you don't see them. You will avoid collision if you pay up the insurance premium.

I think china is preparing for war fairly soon. We just have to get used to the idea that a Chinese ship that hasn't been tracked to a port and loaded with war materials is not a threat. I would not like to be Taiwan or Australia... Oh wait... Damn.

I think they will take Philippine and Malaysia before Australia; so you have more time.

On a sunny day (Wed, 24 Nov 2021 06:55:22 -0800 (PST)) it happened Ed Lee snipped-for-privacy@gmail.com wrote in snipped-for-privacy@googlegroups.com:

I know they have their own GPS sats

If they had in the RF bands any spectrum analyzer would see it and decoding would not be such a big thing I'd expect.

They don't have to follow any standard freq.

Yes, just prudent speculation.

At the very least, the ships can just report their positions to a central data center and figure out the mapping.

On a sunny day (Wed, 24 Nov 2021 10:54:54 -0800 (PST)) it happened Ed Lee snipped-for-privacy@gmail.com wrote in snipped-for-privacy@googlegroups.com:

That is not so simple, reliable communication from sea to shore and vice versa over long distances is very hard. Even when using satellite, dish aiming or outages when using lower constellations is an issue. The whole idea was to work ship-to-ship on short distances for collision avoidance, basically within the horizon (else earth curvature gets in your way, required antenna hight then goes up).

But if you have a big company (China) controlling all their ships, they can have reliable point to point data links between ships. Including all their para-military fishing boats, they have a big surface network, not to mention all the satellites in the sky.

But we have an idiot prime minister who keeps poking the dragon for his own political gain without taking any meaningful steps to secure the country in the short to medium term.

Yes the deal to acquire nuclear subs is nice but the UK and US aren't going to lease them to us and there is no plan or building timetable all of which means, as analysts have pointed out, that we will have a period where our soon to be creaking, old subs will only safely work at vastly reduced ability or not at all. The capacity gap has been pointed out for years as has a solution- while the SA ship yards are otherwise idle build a few more modernized Collins class at a one a year schedule.

On a sunny day (Wed, 24 Nov 2021 12:45:03 -0800 (PST)) it happened Ed Lee snipped-for-privacy@gmail.com wrote in snipped-for-privacy@googlegroups.com:

LOOPTHELOOP: >> >> If they had in the RF bands any spectrum analyzer would see it >> >> and decoding would not be such a big thing I'd expect. >> > >> >At the very least, the ships can just report their positions to a central >data center and figure out the mapping. >> That is not so simple, reliable communication from sea to shore and vice versa >over long distances is very hard. >> Even when using satellite, dish aiming or outages when using lower constellations >is an issue. >> The whole idea was to work ship-to-ship on short distances for collision avoidance, >> >basically within the horizon (else earth curvature gets in your way, required >antenna hight then goes up). > >But if you have a big company (China) controlling all their ships, they can >have reliable point to point data links between ships. Including all their >para-military fishing boats, they have a big surface network, not to mention >all the satellites in the sky. GOTO LOOPTHELOOP