HomeLatest ThreadsGreatest ThreadsForums & GroupsMy SubscriptionsMy Posts
DU Home » Latest Threads » Forums & Groups » Topics » Science » Science (Group) » Planet's erratic magnetic... » Reply #1

Response to Eugene (Original post)

Sat Jan 12, 2019, 05:31 PM

1. Smartphones use GPS for navigation, not a compass

http://fortune.com/2019/01/11/earth-magnetic-north-pole-shifts-forcing-update/


<snip>
The previous model of the magnetic field was released in 2015 and updates have been slated for 5-year intervals. However, the changes are massive enough for military and civilian navigation—mostly in the Arctic Ocean—that the latest revision had to appear in 2019. A surge in 2016 happened just after the last model was set, making the update more critical four years out.

This update doesn’t affect GPS receivers, which don’t rely on the magnetic north pole. A receiver instead picks up signals from multiple satellites for which the exact position in orbit is known, and use trilateration (the intersection of their signals) to determine a location. However, satellite orbits are optimized for reception in the most-populated parts of the world, and other factors reduce GPS accuracy and reception in the Arctic.
<snip>

Reply to this post

Back to OP Alert abuse Link to post in-thread

Always highlight: 10 newest replies | Replies posted after I mark a forum
Replies to this discussion thread
Arrow 5 replies Author Time Post
Eugene Jan 2019 OP
LineNew Reply Smartphones use GPS for navigation, not a compass
Yonnie3 Jan 2019 #1
LakeSuperiorView Jan 2019 #2
rickford66 Jan 2019 #3
Yonnie3 Jan 2019 #4
rickford66 Jan 2019 #5
Please login to view edit histories.