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A ruled line of a rectangular coordinate system.
Also known as: Grid square line, Eastings and northings, UTM grid line
Grid lines are a rectangular coordinate system printed over the map, unrelated to latitude and longitude. Every country runs its own, so a grid reference is meaningless without knowing which grid it belongs to.
Rules a rectangular coordinate system across the map face, allowing any point to be given as a numeric reference.
Contexts: Maps
Belongs to a national or zonal system rather than to latitude and longitude, so a reference is ambiguous without naming its grid.
Contexts: Maps
Is drawn separately from the graticule of latitude and longitude, which most maps also carry and which does not align with it.
Contexts: Maps
Straight parallel lines ruled at right angles across the whole map face, numbered along the margins.