Newser on MSN1 天
Canada Can No Longer Claim the Magnetic North Pole
GPS systems around the world are adjusting to a new model tracking Earth's magnetic north pole, the point that attracts the ...
The Manual on MSN4 天
How to use a compass for navigation when GPS fails
It's a shame how many people don't know how to use a compass, especially when the National Park Service lists it as a top 10 ...