There appears to be a rope-like device on the emergency equipment training board (8th picture), with some bicone shapes.

Anyone know what that is?

Perhaps an escape rope for the pilots?

EDIT: Yup, here it is in action: https://www.jetphotos.com/photo/7389569

Yes, that looks like an escape rope for pilots.

https://www.aviation-gadgets.com/photo/virgin-australia-boei...

I am glad you found that. Someone asked our guide, and I missed the explanation!

In the file https://github.com/MartinGalway/C64_music/blob/main/ocean_as...

> DSP

> not entirely sure what this one is... another variation of "Define Space" ? check back for the correct definition of this

It's probably 'displacement'. This worked together with ORG ('origin'). ORG specifies where in memory the code will run. DSP then moves the code the specified amount further along in memory, with the understanding that it will be moved back to the ORG address when it needs to run.

> DFC

> not entirely sure what this one is... define characters?

Same as DFM, but generates PETSCII instead of ASCII.

Small and low energy enough that tiny migratory birds can wear them for months. Externally worn of course (e.g. attached to the ear, for a wolf).

You could adjust the firmware of a wildlife tag to start transmitting location every 10 minutes when the animal leaves a geo-fence.

Bird ones are easy because birds are high in the air, so there's nothing to block the signal.

They are also not implanted in the birds, but are a relatively large "backpack" or leg tag.

Michael Abrash and Fabien Sanglard have excellent books on Quake.

It’s indeed vacuum deposited metal on natural quartz crystal.

"While the cross-stock mean buy-and-hold return is over 30,000%, the median is -6.9%. Shareholders' wealth was enhanced by $91 trillion over the century, but long-term investors in nearly 60% of stocks incurred wealth reductions"

Better article with pictures (2023): https://www.bbc.com/news/world-middle-east-64825526

From BBC:

  The officials say it could have been created to redistribute the pyramid's 
  weight around the entrance or another as yet undiscovered chamber.

From TFA:

  Specialists have linked the corridor to the pyramid’s internal load 
  management. Its position near the entrance and behind the gabled stonework 
  suggests it may have helped redirect the immense weight pressing down from 
  above, much as the relieving chambers over the king’s chamber were designed 
  to protect spaces below. 

Yeah, looks like a "relieving chamber" [0] to me. It'd be interesting to take the densities from muon tomography and plug them into finite element analysis. A recent paper using the muon tomography data to inform comparisons of ramp styles [1] says that further data is needed:

  The possibility that the NFC functioned as a relieving chamber has been 
  previously suggested, though without consensus.  . . . where the NFC’s gabled 
  vault—an architecture well known for load redirection—could act as a 
  stress-moderating feature, limiting transmission toward the Descending 
  Passage. This interpretation remains hypothetical and does not imply 
  intentional design integration; it is based solely on geometric compatibility 
  and structural plausibility. Verifying a load-management role will require 
  dedicated finite-element analyses constrained by ERT geometry and improved 
  characterization of internal stratigraphy. 

0. https://engineering.stackexchange.com/questions/37189/engine...

1. https://www.nature.com/articles/s40494-026-02405-x

(The ‘sword’ is called leeboard in English)

Thank you, I did not know the term!

This account is an LLM IMHO.

> This account is an LLM IMHO.

I like HN, and I'm not a native speaker.

I do use LLMs to refine my wording, but I am not an LLM.

I think many prefer poor English over LLM English.

Understood. But my priority is whether the words express my thoughts crystal clear — clarity over style.

I think many prefer AI writing to whining about AI writing.

Yes, but HN is dominated by the latter aggressively irrational folks. Look at how many of kindkang2024's comments with perfectly reasonable content are dead--the nuttiness has infiltrated mod policy.

This is getting more annoying than the LLMs.

Right? But it's now HN policy ... look at how many of kindkang2024's comments are dead.

Sextants were used for coastal mapping though, albeit specialized ones called hydrographic sextants.

You can see one here: https://sextantbook.com/2019/01/13/a-french-hydrographic-sex...

The linked article is by W.J. Morris, and his book on sextants is in my opinion one of the standard works and much recommended.