To mark or provide with a graticule (a grid pattern of lines); to create a lattice or grid structure on a surface.
From Latin 'graticulum' (small grid, diminutive of 'cratis,' wicker) plus the verb suffix '-ate.' This technical term emerged in cartography and scientific work.
Cartographers 'graticulate' maps by marking latitude and longitude lines—a technique that's been used for over 2,000 years to make maps transferable and searchable, basically the medieval version of adding GPS coordinates.
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