How is the Grid-Magnetic angle typically depicted on a map?

How is the Grid-Magnetic angle typically depicted on a map?

• A. As an arc between grid-north and magnetic-north prongs
• B. As a dashed line connecting grid-north to true north
• C. As a straight line along a meridian
• D. As a dotted circle around the pole

Answer: (A)

The grid-magnetic angle is the angular difference between grid north and magnetic north, and it’s shown on the map as an arc between the grid-north direction and the magnetic-north direction. This curved arc, often with two prongs at the ends to mark GN and MN, visually communicates how far and in which direction MN is from GN. The value is usually labeled on the arc, making it easy to convert bearings when using a map with a compass. Other depictions would not convey the specific offset between grid north and magnetic north: a dashed line to true north would describe GN to true north, a straight line along a meridian implies a single direction, and a dotted circle around the pole isn’t used to show this angular difference.

The grid-magnetic angle is the angular difference between grid north and magnetic north, and it’s shown on the map as an arc between the grid-north direction and the magnetic-north direction. This curved arc, often with two prongs at the ends to mark GN and MN, visually communicates how far and in which direction MN is from GN. The value is usually labeled on the arc, making it easy to convert bearings when using a map with a compass. Other depictions would not convey the specific offset between grid north and magnetic north: a dashed line to true north would describe GN to true north, a straight line along a meridian implies a single direction, and a dotted circle around the pole isn’t used to show this angular difference.