The illustrations should also show that the field lines are somewhat vertical in the Arctic and Antarctic circles. The compass does not actually work in those locations, as it attempts to align with the field lines and point downwards into its dish.
Do I really have to do this again? Yes, "field lines are somewhat vertical in the Arctic and Antarctic circles.", NO, the compass does work at least over large parts of Antarctica, where the South Magnetic Pole is actually quite a bit outside Antarctica. A compass designed for Antarctica must be used, but magnetic compasses are used for navigation around Antarctica.
I will give a bit from my other post, if you want more see: https://forum.tfes.org/index.php?topic=4550.msg89152#msg89152 (https://forum.tfes.org/index.php?topic=4550.msg89152#msg89152)
Why do you choose a computer simulation of the field lies, and not give actual measurements? Yes, I know the answer to that - you like so many others choose to make the Globe model seem as ridiculous as possible.
Had you given actual figures you would have found that, while the inclination is very high[/b] and declinations very variable the magnetic compass is still a valuable navigation tool over much of Antarctica.
You really should take a look at : http://www.usap.gov/travelAndDeployment/documents/FieldManual-Chapt21AntarcticNavigation.pdf (http://www.usap.gov/travelAndDeployment/documents/FieldManual-Chapt21AntarcticNavigation.pdf), where it says:21.2 Magnetic Compasses
Magnetic compasses must be modified for use in polar latitudes by reweighting the needle. As the compass gets closer to the South Pole, the south-seeking end of the needle is pulled downward toward the earth and will drag on its enclosure unless the proper nonmagnetic counterweight (copper wire) is added to the northseeking
end.. . . . . . . . . . . . . . .
Field parties may elect to travel by using a Grid North system (see the “Grid North” section), versus a magnetic or truenorth(1) system.
(1) TrueNorth on the Antarctica grid system is defined as the 0° Longitude Line through Greenwich
If you would like to debate on the subject, please take it to another thread. This thread is about visualizations.
Fine by me, but I did think you were trying to give visualisations of the real earth!
The illustrations should also show that the field lines are somewhat vertical in the Arctic and Antarctic circles. The compass does not actually work in those locations, as it attempts to align with the field lines and point downwards into its dish.
You state that "The compass does not actually work in those locations, as it attempts to align with the field lines and point downwards into its dish.",
but as I have stated a number of times the South Magnetic Pole (on the real earth) is not even in Antarctica and a magnetic compass does work over much of the continent, even at McMurdo Station!
But, carry on with you fantasy.
I said the Antarctic Circle, not "Antarctica".
I stand by what I said. Over most of the area inside Antarctic Circle a properly designed and adjusted magnetic compass does work. There is a very large inclination, compensated by weighting (the actual force is very small!), and a very large and variable declination (variation) which is reasonably well mapped. I can give maps of these if you wish.
At present the South Magnetic Pole (dip pole - vertical field) is at 64.2°S 136.4°E, not even within the Antarctic Circle.
This makes "The field lines on the Mono-Pole model would look something like this" grossly inaccurate for the real world. If you are trying t visualise a magnetic field for the flat earth, please make sure it looks something like reality.