171–180 of 212 posts
Somewhat off topic. What do big military submarines use these days to navigate? Do they have nav systems based on topographic data of the sea floor? (I dont know if it is mapped to the degree its possible). Could that be read accurately with only passiv sensors? I think you could read it perfectly with sonar whatever that may have evolved into these days. I guess they could reach depth where they can poke an extraord…
Earlier quoted context omitted.
Yeah, this surprised me as well. I get how reading ocean swells, sea life, birds, ocean color (indicating depth and/or plant life below) could give a general sense of position. And I can see how stars, prevailing currents and maybe even estimates based on the relative movement of clouds (adjusted for ambient wind direction and weather conditions) could give a general sense of distance traveled. But on a completely cl…
> I'm not sure how the concept of tracking virtual islands over the horizon really helps. The only thing I can think of is maybe the idea of it encourages the navigator to stay focused on estimating the passage of proxy points on the far horizon You can practice navagating against physical islands over the horizon, and when you're good at that, you've mostly gotten good at dead reckoning against a real reference poin…
The name is perfect. "Etak" refers to a system of navigation used by Micronesian and Polynesian seafarers to navigate from island to island in the vast Pacific Ocean. Much like this device, it operates by "augmented dead reckoning" (as it says in TFA). The etak system of navigation involves navigating by stars and ocean swells to get the heading, but a key issue when navigating by dead reckoning over long distances i…
I've read somewhere that part of the method they intuited their way was to read the waves. As faraway land masses can affect the shape of waves, supposedly these navigators could "see" beyond the horizon due to how the swell was behaving. I can sort of see that in a mind's eye, with rings of waves spreading as they bounce off obstacles in water. But that's bird's view of a miniature -- and seeing that from the surfac…
They could see from the patterns in the waves, thousands of miles away, where the land masses were.
>insert joke about training neural networks
(If anyone knows the original quotes, please post below.)
Earlier quoted context omitted.
Singapore, Germany, the UK, USA, Australia, .. countries with airports that want domestic security, etc. https://www.trd.sg/ https://hp-jammer.de/en/drohnenabwehr/ etc. Once you start looking at GPS spoofing, etc. it gets quasi-military, non-commercial, requires credentiuals | LEO contacts, ways to work around checks and balances: https://www.regulus.com/ is Israeli miltech, other companies in other countries are sim…
It's definitely not happening in the US. I've heard of it a bit in UAE, but not much elsewhere, so I was curious where the OP was observing this.
Sure, that's not commercial .. but it's a Federal LEO with a tan shirt and shorts and a truck with "UAS Mitigation Systems" in the back.
https://www.faa.gov/airports/new_entrants/uas_detection_miti...
UAS mitigation or countermeasures include the capability to disrupt, disable, destroy, take control of, and/or provide alternate flight instructions to a UAS.
Some UAS detection systems may have countermeasure capabilities built-in, which can be disabled, while others may offer them as an optional modular capability.
FAA currently does not support the usage of C-UAS systems by any entity other than the federal departments (Defense, Homeland Security, Justice, and Energy) that have explicit statutory authority to use this technology.
Grey market availability.
Earlier quoted context omitted.
I just love the look of vector displays and I wish they were more common still today. Such a cool aesthetic!
Me too. Atari, toward the end, had even mastered color vector displays that look excellent! Look for clips of "Star Wars" in action. The 70's was anni interesting time. Atari was employing dynamic vector displays capable of real time motion. Tektronix was using vectors with their storage CRT tech. Basically the vectors got painted onto the tube phosphors, thus displaying the image without the need to refresh. 4k reso…
The name is perfect. "Etak" refers to a system of navigation used by Micronesian and Polynesian seafarers to navigate from island to island in the vast Pacific Ocean. Much like this device, it operates by "augmented dead reckoning" (as it says in TFA). The etak system of navigation involves navigating by stars and ocean swells to get the heading, but a key issue when navigating by dead reckoning over long distances i…
I've read somewhere that part of the method they intuited their way was to read the waves. As faraway land masses can affect the shape of waves, supposedly these navigators could "see" beyond the horizon due to how the swell was behaving. I can sort of see that in a mind's eye, with rings of waves spreading as they bounce off obstacles in water. But that's bird's view of a miniature -- and seeing that from the surfac…
Earlier quoted context omitted.
That was 1995. In 1991, we had the ubiquitous intercontinental phone network, but overseas connections were >$1/minute and data rate was only 9600 baud.
Stretching the definition a little, satellite TV had been a thing for years by then. Neiman Marcus was selling satellite dishes in 1979.
https://www.amazon.com/Principles-Arab-Navigation-2013-02-28...
How timely! I was watching a video about the ill fated Vector W8 supercar last night, and wondered about that awesome CRT proto-GPS thing seen in some shots. https://www.youtube.com/watch?v=QFDBs15EYjs
The name is perfect. "Etak" refers to a system of navigation used by Micronesian and Polynesian seafarers to navigate from island to island in the vast Pacific Ocean. Much like this device, it operates by "augmented dead reckoning" (as it says in TFA). The etak system of navigation involves navigating by stars and ocean swells to get the heading, but a key issue when navigating by dead reckoning over long distances i…
This sounds very romantic, but they were mostly at drift. Most very using rafts without any form of propulsion. "Navigation" across wast distances was one way road with no return ticket. They had to do it for overpopulation, not for some explorative spirit.