Part 3 of Ralph Griswold's Pattern Tours series, on ways to represent tours (ordered paths through the cells of a grid) used to generate patterns. It covers graphical representations (line drawings, numbered grids, overlays) and their drawbacks, then data representations: coordinate lists that pair with a color band to specify a pattern, and navigational strings built from compass letters or L-System symbols. Examples include von Neumann, Moore and knight's-move tours.