1. An optically readable tag, comprising: a data region comprising a two-dimensional array of hexagonally shaped data features, the data features having one of two optically contrasting values, the data features comprising: a plurality of primary data bytes, the primary data bytes comprising a greater number of data features encoding a lesser number of data bits within the data region so that there is a 50:50 ratio of a first optically contrasting value to a second optically contrasting value, and a plurality of directly recorded error checking bits; one or more orientation features located on the tag outside of the data region; and a tracking feature located outside of the data region and having a larger size than the orientation features and the data features.