Earth's Magnetic Field Explained

Опубликовано10.11.2018 в 02:48АвторJoJosar






True North vs Magnetic North (Magnetic Declination)

Using Map and Compass Even after years of using a map and compass I could never remember how to correct for declination. Do I add declination or subtract it? What if I'm out west versus in the east? While navigating through dense fog on a sea kayaking trip, I finally came up with an easy way to remember.

As long as you remember the basic principles, you can easily work it out in your head. What's your Map Declination? The first thing you need to know is where you are in relation to magnetic north. You can find this information by looking on your map legend. If you look at the map of North America in Figure 6. If you are on the line where the declination is 0 degrees, then you don't have to worry about any of this, since magnetic north and map north are equivalent.

Wouldn't it be nice if all your trips were on the 0 degree of declination line? If you are to the right of that line, your compass will point toward the line to the left and hence the declination is to the west. If you are to the left of the line, your compass will point toward the line to the right and hence the declination is to the east. The compass is used primarily to take bearings. A bearing is a horizontal angle measured clockwise from north either magnetic north or true north to some point either a point on a map or a point in the real world see Figure 6.

Bearings are used to accurately travel to a destination or to locate your position. If you are working from your map, it is called a map bearing and the angle you are measuring is the angle measured clockwise from true north on your map to this other point on the map. If you are taking a bearing off a real point on the landscape with a compass, you are using your compass to measure the angle clockwise from magnetic north to this point on the landscape.

This is called a magnetic bearing. Remember that the bearing is measured clockwise. If you think of true north as 12 o'clock then a bearing to the right of that 1 o'clock is greater than true north and a bearing to the left of True north 11 o'clock is less than true north.

If, you think about your map as an artist's rendition of the world. It displays true north, but it doesn't include magnetic fields as the real world does, so you need to make accommodations when going from your map to the real world. The basic principle is this: Otherwise, you will need to make your own bearing corrections by adding or subtracting the declination amount.

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That gives us 4 possible permutations to work with: You need to make the two bearings equivalent by adding or subtracting the declination. This is illustrated in Table 6. Map Bearing to Magnetic Bearing: If you are taking a bearing from one point on your map to another point on the map with respect to true north, then you are working with the map bearing.

17 Feb The Magnetic North Pole is a point in Northern Canada where the northern lines of attraction enter the Earth. Compass needles point to the.

Now you want to figure out where your position is in the magnetic bearing. In order to transfer this information back to your magnetic bearing you need to add the declination to your map bearing bearing to create the proper magnetic bearing. Magnetic Bearing to Map Bearing: If you use your compass to take a bearing from your current position to a point on the landscape, then you are working with the magnetic bearing.

Now you want to figure out where your position is on the map. In order to transfer this information back to your map you need to subtract the declination from your magnetic bearing compass bearing to create the proper map bearing. If your declination is East then magnetic north is greater than true north the map bearing is greater than the magnetic bearing.

You need to make the two worlds equivalent by adding or subtracting the declination. In order to transfer this information back to your magnetic bearing you need to subtract the declination from your map bearing compass bearing to create the proper magnetic bearing bearing. In order to transfer this information back to your map you need to add the declination from your magnetic bearing compass bearing to create the proper map bearing.

If the declination is

Using Map and Compass Even after years of using a map and compass I could never remember how to correct for declination. Do I add declination or subtract it?


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{REPLACEMENT-(Зайцев.нет)-(web-climat.ru)}The needle rotates until one end the black end in this case points to magnetic north and the other end the red points to magnetic south! I thought a compass needle points towards North! Now you're telling me it points somewhere else! Oh well, I know when I'm beaten!

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Comments: 1

  1. 19.11.2018
    Malashura

    Instead of criticising write the variants.