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Names and codes identifying a topographic sheet and its neighbours.
Also known as: Quad sheet marking, Adjoining sheets diagram
United States topographic maps are published as quadrangles bounded by lines of latitude and longitude, each named after a feature within it and listing its eight neighbours in the margin. The neighbour list is what lets a walker work out which sheet to buy next.
Identifies a topographic sheet by the name of a feature within it, the sheet being bounded by parallels and meridians rather than by a grid.
Contexts: Maps
Lists the eight adjoining sheets in the margin, which is how a user identifies the next sheet needed along a route.
Contexts: Maps
Nine printed names arranged in a square of three rows and three columns in the map margin, the centre left blank.