Declination information is usually printed on USGS quadrangles to the left
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Declination information is usually printed on USGS quadrangles to the left

Part 1. Map Orientation

1a. Declination information is usually printed on USGS quadrangles to the left of the scale bar at the bottom of the map. Copy the declination diagram from your quadrangle.

1b. According to this declination diagram, what is the magnitude (degree) and direction of the magnetic declination on your map?

1c. What is the date of this information?

1d. Does true (geographic) north point to the east or to the west of the direction of your compass needle?

1e. Current magnetic declination can be estimated for your location at the NOAA Geophysical Data Center website, http://www.ngdc.noaa.gov/geomag-web/#declination. What is the current declination for your location?

1f. By how much is it changing every year, and in which direction?

Hint
ScienceDeclination is defined as the angle between magnetic north and the true north. However, the diagram on the topographic map sheet gives the value of the angle between magnetic north and grid north, which is referenced to the grid lines shown on the map. This angle is properly called grid declination....

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