The declination diagram on a map is used for which conversion?

The declination diagram on a map is used for which conversion?

• A. Grid to Magnetic conversion
• B. True North alignment
• C. Reading the map legend
• D. Measuring contour intervals

Answer: (A)

Declination diagrams encode the angular relationship between the map’s grid north and magnetic north (and often show how grid north relates to true north). This lets you translate bearings between the map’s grid system and a compass. When you have a bearing in grid terms, you apply the shown declination to obtain the magnetic bearing you’d use with a compass, or reverse to plot a magnetic bearing onto the grid. That’s why it’s used for grid-to-magnetic conversion. The other options don’t fit because reading the legend or contour intervals isn’t about orientation, and aligning to true north isn’t the purpose of this diagram.

Declination diagrams encode the angular relationship between the map’s grid north and magnetic north (and often show how grid north relates to true north). This lets you translate bearings between the map’s grid system and a compass. When you have a bearing in grid terms, you apply the shown declination to obtain the magnetic bearing you’d use with a compass, or reverse to plot a magnetic bearing onto the grid. That’s why it’s used for grid-to-magnetic conversion. The other options don’t fit because reading the legend or contour intervals isn’t about orientation, and aligning to true north isn’t the purpose of this diagram.