What does grid north refer to?

Grid north refers to the north that is established by the vertical grid lines on a map. These grid lines are part of the coordinate system that helps users navigate and determine specific locations on a map. Unlike true north, which is based on the Earth's axis and compass north, which refers to magnetic north indicated by a compass, grid north is specifically defined by the orientation of the grid in the mapping system. This makes it crucial for understanding how to accurately interpret maps and use them for navigation and positioning.