Which diagram would you consult to understand the relationship between true north, grid north, and magnetic north?

Which diagram would you consult to understand the relationship between true north, grid north, and magnetic north?

• A. Declination Diagram
• B. Bar Scales
• C. Legend
• D. Adjoining Sheets Diagram

Answer: (A)

Understanding how true north, grid north, and magnetic north relate is about magnetic declination and how the map’s grid is aligned with the Earth's geography. The diagram that best communicates this is the Declination Diagram, because it visually presents the three north references and the angular differences between them. It shows the angle from true north to grid north (grid north offset) and the angle from true north to magnetic north (magnetic declination), often including the annual change. This helps you translate compass readings to map bearings and orientation in the field. Bar scales are about distance, legends explain symbols, and adjoining sheets diagrams show how neighboring maps line up—none of these depict the relationships between the three north references.

Understanding how true north, grid north, and magnetic north relate is about magnetic declination and how the map’s grid is aligned with the Earth's geography. The diagram that best communicates this is the Declination Diagram, because it visually presents the three north references and the angular differences between them. It shows the angle from true north to grid north (grid north offset) and the angle from true north to magnetic north (magnetic declination), often including the annual change. This helps you translate compass readings to map bearings and orientation in the field. Bar scales are about distance, legends explain symbols, and adjoining sheets diagrams show how neighboring maps line up—none of these depict the relationships between the three north references.