A 180° declination signifies that the magnetic north pole is in the opposite direction of the geographic north pole. This implies that a compass would point directly south from a given location.
Isogon Lines:
Lines on a map connecting points of equal magnetic declination are called isogonic lines. An isogonic line with a 180° declination would pass through points where compasses would point south.
Significance:
While magnetic declination varies across the globe, 180° is an extreme value, suggesting a significant distortion of the Earth's magnetic field at that specific location.

For example, a compass positioned between the magnetic and the geographical North Pole will point due south, towards the magnetic pole and away from the geographical pole, amounting to a magnetic declination of around 180°.

😎

In my opinion you are wrong, but you are very close. In fact the definition is right but the conclusion and therefore the answer is wrong.
However, before telling you my answer and justifying it, I want to wait for other answers or possibly your second thoughts.

You are at the Magnetic South Pole..

Magnetic Declination is the angle between True North and Magnetic North. 180deg Dec puts you at the Magnetic South Pole..

But according to that logic the Antarctic is a land mass so you now have me confused

I guess it depends on where you are. If you are in Antartica, the answer would be The Arctic and vice versa. I think....

Pat I translated earlier that the question was easy.
But your answer is South Pole?
I can't translate quickly and I miss the changes.
You must excuse me Pat, bear with me.

Are you sure Pat?
I think the answer is different but I could be wrong.
Let's wait for the others' answers and then I'll tell you mine.
It could be a nice debate.

Concur...

That one is a tricky question only 2 answers it could be - the south Pole - do I move up one place for that

Good evening everyone, the question I propose is still on the subject of naval cartography.
You can answer even without consulting the internet, just reason on the basis of your geographical knowledge.
Anyone who lives anywhere on the globe (from Alaska to New Zealand) can guess the answer.

If (today) I detect that the magnetic declination has a value of 180 degrees where am I?

A good approximation is enough for me.
Just say the continent and not a precise coordinate for the answer to be considered exact.

Yep, I'm stumbling again!

I remember all the Champs and Bosun dinghy moored in the Lee of Bristol, you had to have your wits about you when coming round the stern to open water, wind and tide could easily catch you unawares. I was in Wallasey unit and taught ME courses at HMS Gannet in Scotland...

This seems a appropriate time to answer the question re Bristol’s secondary role

With the introduction of more ferries running out of Portsmouth- concern was expressed that the turn into the channel would cause excessive wash which could cause the erosion of the shore of Whale Island hence the decision to moor the HTS there
It also created a Lee for alll the boats hosted by the HTS

At one time schools regularly used to take pupils interested in going the navy for an aquaint week and hosted on the HTS

Father was CO of a unit in the Midlands then there were more areas than now

Pat, were/are you in the SCC by any chance? The Gun Run has been somewhat dumbed down in later years on the grounds of "safety"...

The role played by HMS Bristol has been forefilled by a few ships namely:-

HMS Kent
HMS Ulster
HMS Rame Head

Before that cadets were accommodated in North Battery just a short distance from the JR Dining Room

How uncanny Nick my next question after Alessandro comments was going to be what are the origins of the Royal Naval Field Gun Run.

BTW it is still run for any all the Armed Services and is normally hosted at HMS Sultan

Re HMS Bristol. The Bristol has hosted cadet training and summer camps since 1991, giving youngsters a taste of life on board. There was no galley and we had to march the cadets up Whale Island to he Junior Rates mess for feeding. As staff we ate in the Senior Rates mess (officers in the Wardroom) On display in the lobby of the SR's mess was a set of skis and cold weather gear once belonging to Petty Officer Evans of Captain Scott's ill fated polar expedition. There was a gun run training track where the Pompey team practiced what can only be described as one of the most brutal races on the planet. Anyway, back to HMS Bristol, apart from cadet accommodation, the engineering branch carried out slinging exercises, ie moving heavy machinery in confined spaces, and "other branches" of the service carried out what I can only describe as errr, ship invasion techniques. Last time I was on board was over 10 years ago and she was in a state then. It would have cost a fortune to bring her accommodation up to current standards. I believe Sea Cadets have limited accomodation on Whale Island for training courses, boat work courses etc, with HMS Caledonia in Scotland providing unit camp spaces. For those interested I have added a link to video of the field gun race, an event steeped in RN history.

Understood Alessandro - I will bear that n mind should I post anymore- BTW try again on your answer - sorry

Nick, I quote your entire post.

After the AI-created question of the day, I'll try to answer Pat's question.

Since I don't live there, and I don't read the local newspapers, I had to do some research on the web.
I didn't find a specific answer.
I searched for specific news on "breakwater function" and I didn't find any about the HMS Bristol.
There is no news about the "homeless shelter" function for this ship either.
At this point, reasoning logically, since off Whale Island it was used as a harbor training ship, I can assume that it hosted dignitaries for various events.
So I would opt for answer 1 to Pat's question.

I really like these "human" questions.
However, I'd like to make a suggestion Pat, which is definitely not a criticism:
The questions should have a more global nature (even if rightly restricted to the naval and modeling field) because otherwise only those from that area can answer.

Alessandro... I tend to remember the stuff that interested me, and not so with stuff that didn't. Metalwork and woodwork, I never stopped, Geography and History still hold interest for me. High mathematics made me switch off but I can still solve triangles and all things pi. Chemistry taught me rules regarding acids and bases, and the safe way to mix them with water ( pickle for silver soldering) and the practice of making distilled water for my boilers.. Physics was also a handy subject, we all need Ohms Law to calculate fuse ratings and battery work, Boyle's law, Gay Lussac's law and Charle's law ( combined gas laws) are essential in model boiler making. And so it continues. 15 years ago I did an Open University science foundation course, purely out of interest whilst I was recovering from major surgery which allowed me to Polish up my maths and taught me that observation was of paramount importance. We continue to learn throughout our lives, In our hobby, we have ample opportunity to apply scientific and mathematic principles, most of the time without realising. I first learned to use a lathe in school and have had one ever since, same applies to using saws and planes to work wood. All in all, stuff learned in school will stand you in good stead for a productive life...

Regarding today's question about the capstan, some time ago I had to do some thorough research on this very object.
Since I started from scratch in the gunboat project (schooner-armed), I didn't know how to make the capstan, whether to put it, how many to put and, if necessary, where to put them.
After much research on similar and contemporary ships, I found the correct point to position it.
In the meantime, I have acquired a lot of technical and historical information on this object.
In 1/60 scale, I made the quickest choice (which I'm certainly not proud of): I bought a ready-made one in a model shop.
I prefer to make some pieces myself, but sometimes I use the ready-made ones.
If they are badly made, I am forced to make them from scratch.
For example, I liked the anchors and I bought them already made in perfect scale (there were various sizes).
The cannons of that period simply do not exist (not even Amati of Turin makes them, nor Mantua of Mantua) and so I had to make them from scratch, including the initial design (based on photos of the time).
In general, I now try to optimize time, if I can.
For the lifeboats it's a different story, I made them myself (including the initial design) because I like making hulls. I wouldn't have deprived myself of this pleasure even if I spent a lot of time.
Unfortunately, I already know that I will have to make the compass myself, the ones on the market are too rough or out of scale.
The same goes for the lateral cranes.

Nick you wrote:
"""""""""Alessandro, Paying attention in Geography has finally paid off after 55 years since leaving school! """""""""

Well! The result seems to be excellent.
When we leave school a process of "descolarization" begins.
It is inevitable that mathematical, physical, chemical, geographical, historical and all the other notions are gradually lost over time if they are not revived in some way.
I try to counteract this tendency with a process that I call "antidescolarizzione".
It consists of this: every occasion is good to revive the notions and quizzes are part of the process.
Those who read up on books, TV documents or the internet to answer questions revive the notions and perhaps learn others.
Even written or oral discussions on technical or scientific topics (we tend to talk more often about sports, especially football and politics, gossip or trivial topics) are very important.
A small part of the day is enough to activate the virtuous process.

Lucky guess on this one today.
I very nearly went for A but then thought better of it and plumbed for B instead.
Don’t know why but just as well I did.

Well following on from my disaster of a question yesterday I thought I would ask a more topical question today :-

HMS Bristol is currently on her way to Turkey to be scrapped - who can tell me what was her secondary role when she wase moored off Whale Island as a Harbour Training ship ?

1. Provide a venue for Civic Dignitaries for a DTS

2. Act as a breakwater to protect the shore of Whales Island from erosion caused by passing ships in Portsmouth harbour

3. Act as accommodation for homeless people

Well another one right but a move down the board again 😭😭😭😭

The sea ditties they sang kept them in time with each other.
Roy

Alessandro, Paying attention in Geography has finally paid off after 55 years since leaving school!

Great Nick!
A thousand points deserved.

It is important to know the difference between a great circle (ortodromica) and a rhumb line (lossodromica).

To simplify as much as possible.
The great circle is the shortest route, but it does not maintain a constant angle with the meridians. 
The rhumb line maintains a constant angle with the meridians, making it easier to follow with a compass, but it is not the shortest route. 
Mercator, in his projection, made the meridians parallel to each other (but in reality they are not because they converge at the poles).
A straight line on a Mercator projection is equivalent to a curved line in reality.

Shortest distance across the surface of a sphere, ie "the great circle". When projected on to a flat surface the lines look "bent"...

Maybe I asked the question badly in English, because surely someone knows it even without using Google.
But you can certainly use Google.
A gift of 1000 points to whoever guesses it ahahahahah.

Let me try to rephrase better:
Why on a large scale map, which uses the Mercator projection, (for example the Atlantic Ocean) are the routes drawn longer than the path that would be taken simply by joining two points (for example one in Europe and one in America)?

May I suggest that asking associated questions to those already posed may well impact on future questions.

The A.I. is not aware of the content of this thread and so will not know that a question posed has already been talked through.

Remember all the daft questios around soap stone or what ever it was called?

However, not wishing to appear as a wet blanket there is some fun to explore around our A.I. Inquisitor.

I used to set a live quiz for our own club many years ago and one member was always ready to throw in extra information and on one occasion it was the answer to the following question. I gave up after that!

Roy

This time you are forgiven Pat but the question was initially wrong, next time don't do it again, ahahahahah.
I'm joking of course.

I propose a very simple question.
It is simple because it concerns the rudiments of nautical cartography (within everyone's reach without needing to be an admiral).
We have often asked ourselves this even as children.
The question is this:

Why will the route of a plane crossing the Atlantic, if seen on a map that uses the Mercator projection, appear longer than a straight line that joins the two points on the same map?

I hope the question is understandable in English.
If not, tell me and I will rephrase it.

I like the part of the discussion devoted to the female side as being unacknowledged.

Einstien married a lady in his course who was ahead of him among the students.

Dick Francis hardly attended school after 15 and his wife had a degree in English. The books read so well and flow along gracefully.

Things start to become fairer with Marie Curie. A recent film called "The Wife" shows it all off perfectly. If you have not seen it, it is worth seeking out.

Roy

Well done to Nick and Alessandro - it was of course John Harrision that chased the Longitude prize for many years - his first clock (made of wood) and the rest of his clocks are still going and can be seen in the maritime museum at Greenwich

The clock guy, forgotten his name now, Harris was it?

Attribution to John Harrison (1693-1776).

Hi SimpleSailor, if you admit the paternity of the planisphere astrolabe (one of the two types you mentioned) to Hipparchus, you have to admit that it predates the Roman Empire.

For a laugh: let's hope the discussion doesn't get to the fateful and infamous "sunstone", ahahahahah.
Do you remember it?
Two hundred thousand questions proposed by the AI ​​on this "sunstone" of the Norse (to the just despair of CommodoreH who couldn't stand it anymore).
By now I had thought of ordering a couple on Amazon, you never know.

It's all a bit of fun if you like that kind of thing, I did kick myself in one quiz though I could not remember who Freddie Mercury's girlfriend was and it cost me £100 cause I dipped out by 1 point - so so such is life - we cant all be perfect all the time - go on SimpleSailor have a stab at the name I am looking for :-)

Well Pat, I suppose we will have to give you some latitude if the change to longitude 😉. I might not answer because I think I have made a big enough hole to fall in already 😂. I do like questions that make you think and I love researching topics.

OK being an Officer and a Gentleman I will admit I made a cock up in my question - of course I meant Longitude and not Latitude.

Who wishes to modify their answer now ?

Sorry my fault

It will indeed be a good discussion 😁. Because the person "who made the determination of Latitude possible" was Eratosthenes. No one really knows for sure who invented the Astrolabe. The concept goes right back to the Roman Empire, and it has been claimed that it was invented by Hypatia of Alexandria, a female mathematician and philosopher who lived in Egypt in the 4th century AD. Sometimes it is attributed to her father, because women should not have been meddling in such things. As always it depends on which version of history you come across. It should also be noted that there at least two Astrolabe, a planispheric astrolabe mainly used by Hipparchus, who's prime interest was where the celestial bodies were in the sky at any given time. The Marine Astrolabe was a development of the original planispheric astrolabe.

Hi Pat now I'll try to guess your answer.

That is, I'll try to imagine what the correct answer is according to you.
Then I'll tell you what I think is correct.

I imagine that for you the correct answer is the Englishman John Hadley (1682-1744) because he invented the sextant.
The paternity of the sextant is also attributed to the American Thomas Godfrey (1704-1749).

In my opinion, however, the correct answer is Hipparchus of Rhodes who is considered the inventor of the astrolabe. And the astrolabe was useful for calculating latitude even before the sextant.

Now I think a nice discussion will open, well done Pat.

Well one of you is on the right track 😁😁😁

OK - I concede that Eratosthenes was the person that "devised" the system of Latitude and Longitude - but not how to calculate where you are in regards to that.

I will post the answer I was looking for later/expecting in the day - give some more people chance to have a go

Hipporauchamus? (Hope that is spelled correctly) Some Greek chap I believe, it was the clock chap that finally sorted longitude.

Hi Pat. I suppose it depends on where you get the information from 😉.

https://etc.usf.edu/maps/pages/10400/10489/10489.htm

Not the person I was thinking of I believe Eratosthenes was the first person to calulate the circumference of the earth - good try though 😀