This is the Pathfinder hat. Inspired by maps and fair isle motifs. Grid lines and squares represent the distance measures on a map and diagonal directions on a compass. The repeating fair isle style design uses four colours. A contrast colour is used part way through the pattern to create additional interest. Concentric rings reminiscent of contour lines rise up the crown, topped off with a colourful pom pom. Shown above and below in wool from Jameson's of Shetland DK, accent colours are Pumpkin and Caspian.
The pattern also includes instructions for a thee colour version. Shown below knitted in West Yorkshire Spinners Bluefaced Leicester DK - colours, Burnt Orange, Honey and Olive.
Full pattern details for Pathfinder can be found on Ravelry.