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The lines of latitude and longitude.
Also known as: Latitude longitude grid, Map graticule
The network of meridians and parallels drawn or ticked on a map.
Marks lines of latitude and longitude on a map.
Contexts: Navigation, Maps
Curves on most projections, so a graticule that is drawn as a square grid tells a reader the projection has been chosen to make it so — the shape of the graticule is evidence about the map.
Contexts: Navigation, Maps
Distinct from a projected grid, which is straight by construction and measures in metres; a map can carry both, and confusing them gives a reference in the wrong system.
Contexts: Navigation, Maps
Curved or straight lines, or ticks in the map margin, marking whole degrees or minutes of latitude and longitude.
A graticule measures degrees on a curved surface; a projected grid measures metres on a flat one, and a map may carry both.