4:09 There the blue arrow GN points parallel to the inclined Grid, and the TN green arrow parallels the edge of the map. Should it be like that or should the markings be re-rolled? On Swedish maps, GN is always parallel to the edge of the map, and TN is inclined. So the lines that incline are the meridians that point towards TN.
It's up to the cartographer to decide if the vertical edge of the map is aligned with one of the three north references; true, grid, or magnetic. Occasionally, usually to get an odd shaped area to fit a rectangular sheet, none of the norths are at the top of the page. Most of the USGS map series are divided into sheets using latitude and longitude intervals, so it's natural to aline the vertical edges with True North. Many military maps have edges that are are aligned with Grid North. It sounds like the Swedes have decided to align their map edges with Grid North. As a navigator, you need to check the maps you are using in order to understand which lines and edges can be used for referencing the various possible north references.
4:09 There the blue arrow GN points parallel to the inclined Grid, and the TN green arrow parallels the edge of the map. Should it be like that or should the markings be re-rolled? On Swedish maps, GN is always parallel to the edge of the map, and TN is inclined. So the lines that incline are the meridians that point towards TN.
It's up to the cartographer to decide if the vertical edge of the map is aligned with one of the three north references; true, grid, or magnetic. Occasionally, usually to get an odd shaped area to fit a rectangular sheet, none of the norths are at the top of the page. Most of the USGS map series are divided into sheets using latitude and longitude intervals, so it's natural to aline the vertical edges with True North. Many military maps have edges that are are aligned with Grid North. It sounds like the Swedes have decided to align their map edges with Grid North. As a navigator, you need to check the maps you are using in order to understand which lines and edges can be used for referencing the various possible north references.