Provides a 'ggplot2' centric approach to bivariate mapping. This is a technique that maps two quantities simultaneously rather than the single value that most thematic maps display. The package provides a suite of tools for calculating breaks using multiple different approaches, a selection of palettes appropriate for bivariate mapping and a scale function for 'ggplot2' calls that adds those palettes to maps. A tool for creating bivariate legends is also included.