How is the angular difference indicated on a declination diagram?

The angular difference on a declination diagram is indicated by marked angular relationships between different north types. This method visually represents the variation between true north, magnetic north, and grid north, allowing users to easily see the specific angles that need to be accounted for when using a compass or a map in navigation.

This visual representation helps navigators quickly adjust their bearings based on the type of north they are using, providing clarity in understanding how much they should modify their course. By utilizing these marked relationships, users can effectively align their navigation tools with the actual directional requirements based on the geographical location and magnetic variations present in that area.