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Know Which Way You're going? GPS Updated

Alton

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#1
Those pesky magnetic poles keep moving and human guidance systems haven't been keeping up.

'Earth's magnetic North Pole has shifted so much we've had to update GPS' - scientists scrambling to update models



Sarah Kaplan
The Washington Post
Tue, 05 Feb 2019 13:07 UTC






© SteveAllenPhoto/iStock
Magnetic north is not where it used to be.

Since 2015, the place to which a compass points has been sprinting toward Siberia at a pace of more than 30 miles (48 kilometres) a year. And this week, after a delay caused by the month-long partial government shutdown in the United States, humans have finally caught up.

Scientists on Monday released an emergency update to the World Magnetic Model, which cellphone GPS systems and military navigators use to orient themselves.

It's a minor change for most of us - noticeable only to people who are attempting to navigate very precisely very close to the Arctic.

But the north magnetic pole's inexorable drift suggests that something strange - and potentially powerful - is taking place deep within Earth. Only by tracking it, said University of Leeds geophysicist Phil Livermore, can scientists hope to understand what's going on.

The planet's magnetic field is generated nearly 2,000 miles (3,200 kilometres) beneath our feet, in the swirling, spinning ball of molten metal that forms Earth's core.

Changes in that underground flow can alter Earth's magnetic field lines - and the poles where they converge.

Consequently, magnetic north doesn't align with geographic north (the end point of Earth's rotational axis), and it's constantly on the move. Records of ancient magnetic fields from extremely old rocks show that the poles can even flip - an event that has occurred an average of three times every million years.

The first expedition to find magnetic north, in 1831, pinpointed it in the Canadian Arctic. By the time the US Army went looking for the pole in the late 1940s, it had shifted 250 miles (400 kilometres) to the northwest.

Since 1990, it has moved a whopping 600 miles (970 kilometres), and it can be found in the middle of the Arctic Ocean, 4 degrees south of geographic north - for the moment.

Curiously, the south magnetic pole hasn't mirrored the peregrinations of its northern counterpart. Since 1990, its location has remained relatively stable, off the coast of eastern Antarctica.

Livermore's research suggests that the North Pole's location is controlled by two patches of magnetic field beneath Canada and Siberia. In 2017, he reported that the Canadian patch seems to be weakening, the result of a liquid iron sloshing through Earth's stormy core.

Speaking at a meeting of the American Geophysical Union in December, he suggested that the tumult far below the Arctic may explain the movement of magnetic field lines above it.

Scientists for the National Oceanic and Atmospheric Administration and the British Geological Survey collaborate to produce a new World Magnetic Model - a mathematical representation of the field - every five years. The next update wasn't scheduled until 2020.

But Earth had other plans. Fluctuations in the Arctic were occurring faster than predicted.

By the summer, the discrepancy between the World Magnetic Model and the real-time location of the north magnetic pole had nearly exceeded the threshold needed for accurate navigation, said William Brown, a geomagnetic field modeler for the BGS.

He and his US counterparts worked on a new model, which was nearly ready to be released when much of the US federal government ran out of funding.

Though the British agency was able to publish elements of the new model on its site, NOAA was responsible for hosting the model and making it available for public use. This portion of the model didn't become available until Monday, a week after most NOAA employees were able to go back to work.

Some have speculated that Earth is overdue for another magnetic field reversal - an event that hasn't happened for 780,000 years - and the North Pole's recent restlessness may be a sign of a cataclysm to come.

Livermore was skeptical. "There's no evidence" that the localized changes in the Arctic are a sign of something bigger, he said.

Anyway, magnetic field reversals have typically unfolded over the course of 1,000 years or so - giving plenty of time for even the US federal government to adjust.
 

historyrepete

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Dunno if it's pertinent, were on pace for a few changes. equinox shift, complete pole shifts, age of aqurius, whatever that might be. Plus goggle lies by commission and omission. Yet changes they are a coming
 

tigerwillow1

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'Earth's magnetic North Pole has shifted so much we've had to update GPS' - scientists scrambling to update models
It's interesting that this phrase does not appear anywhere in the linked article. Did they fix this fake part of the story since it was first published? From what I've read, GPS is used to track the movement of the pole. The location of the pole does not affect GPS at all. Some apps and systems that use GPS also rely on the pole's location, but the GPS itself couldn't give a whit where the magnetic pole is.
 
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"fake part of the story" - wat?

From last month:
...
Earth’s magnetic pole is moving in the direction of Siberia and away from Canada. This is something that scientists have been tracking for a long time. ... the direction of the drifting pole has been roughly the same for as long as scientists have been tracking it. The speed is the issue.
...
Every five years scientists recalculate the location of the magnetic pole. This is important information for global navigation, which includes GPS satellites and other technology. These changes can make a big difference in our everyday lives.

Scientists at NOAA and the British Geological Survey check how accurate the World Magnetic Model is every year and when they did their check this year they noticed some large differences. Primarily that the pole’s movement had sped up. The location data for the pole was supposed to last until 2020 before it needed to be updated but according to experts at the National Oceanic and Atmospheric Administration, it needs to be updated now.
...
The global model was off because of a geomagnetic pulse the occurred beneath South America in 2016. ... The poles movement has sped up in recent memory from 9 miles a year in the 1990s to about 34 miles a year at present day. A new model needs to be implemented as soon as possible and even then they will have to rework the model again in 2020. Until then navigation might be affected.

What caused the geomagnetic pulse beneath South America is unknown. ...
https://www.forbes.com/sites/kevina...heres-what-you-need-to-know-inforgraphic/amp/
 

AgAuGal

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#5
Yep magnetic pole reversal....what a ride
 

AgAuGal

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#6
Not sure why GPS needs correcting since that pole is fixed. It's magnetic north and south poles that have been moving. Just hoping for no magnetic pole reversal cause that sounds kinda ugly.
 

AgAuGal

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#7
So navigating with compass will be affected yes but GPS?
 

michael59

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So navigating with compass will be affected yes but GPS?
Yeah, I was wondering the same thing.....declination has changed for sure but GPS is satellites already in motion and on set courses.....unless the magnetic compass in the vehicle has something to do with how the data received is displayed.

And, this is from the WashingtonPost and has only one line about this update......which means the idiot that wrote it has a BS in writing or an equivalent…. most likely a BullShit in reporting.
 

AgAuGal

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Yep WaPo such a credible rag....not
 

Bottom Feeder

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#10
Don't overlook the fact that there may be a need to convert GPS north to magnetic north for older navigation systems.
 

michael59

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So we hear about the north magnetic pole shifting but this is the first I have heard that the south magnetic pole has not shifted...?

You know? We might be heading for a catastrophe'. Take two magnets that are stuck together and move them, or just roll one and they repel..... What I do not get is if the south magnetic pole is staying energized/fixed and the north is not as in losing its orientation and if it loses it all together then would not the south magnetic pole reinstitute the gauss lines?
 
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#12
The World Magnetic Model - Uses
Navigation

Compasses have been used for several thousand years to determine direction. They point in the direction of magnetic force at the user's location, and the direction it points is, more often than not, in a different direction than geographic north (toward the North Pole), a more precise direction is achieved by knowing the angle between them (magnetic declination). However, declination changes with location and time, and a geomagnetic model is often used to correct for it. Since the changes in geomagnetic fields are difficult to predict, timely model updates (every 5 years for the WMM) are required for navigational accuracy. The WMM satisfies all these criteria and is therefore widely used in navigation. Examples include, but are not limited to, ships, aircraft and submarines. Magnetometer based attitude (roll and pitch) control is commonly used in aircraft and satellites.

GPS

Why do we need magnetic navigation when Global Position System (GPS) is readily available? GPS provides precise point location but only measures travel direction when in constant motion. A GPS receiver must collect several sets of latitude and longitude pairs to obtain direction. In addition, GPS signals may become blocked due to obstructions, adverse terrestrial and space weather, ionospheric conditions or being underwater or underground. Hence, compasses complement GPS receivers to attain precise and immediate navigational headings for air, ground, and water-based systems. Electronic compasses and the WMM commonly co-exist in GPS receivers.
...
https://www.ngdc.noaa.gov/geomag/WMM/uses.shtml
 

engineear

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So we hear about the north magnetic pole shifting but this is the first I have heard that the south magnetic pole has not shifted...?

You know? We might be heading for a catastrophe'. Take two magnets that are stuck together and move them, or just roll one and they repel..... What I do not get is if the south magnetic pole is staying energized/fixed and the north is not as in losing its orientation and if it loses it all together then would not the south magnetic pole reinstitute the gauss lines?
The scientific name for this is the "weebles wobble but they won't fall down" effect.
 

tigerwillow1

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#14
So as happens so often, the headline is the exact opposite of the truth. The Magnetic Model, not GPS, was updated.
 

AgAuGal

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#15
So we hear about the north magnetic pole shifting but this is the first I have heard that the south magnetic pole has not shifted...?

You know? We might be heading for a catastrophe'. Take two magnets that are stuck together and move them, or just roll one and they repel..... What I do not get is if the south magnetic pole is staying energized/fixed and the north is not as in losing its orientation and if it loses it all together then would not the south magnetic pole reinstitute the gauss lines?
The South magnetic pole has shifted...a lot.
 

michael59

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#16
The South magnetic pole has shifted...a lot.
But, but, but....The BS reporter said it din't…..

What would I know? My left ear ain't pierced because I have not been south of the equator….

EWWWW, now that I think about it....pierced ears and south of the belt...er...equator? EWWWW!