Visualizing spoken corpus data on a map is an invaluable tool both at the stage of data collection (keeping track of numbers of speakers from different regions for corpus balancing purposes) and data exploration (examining the regional distribution of a sociolinguistic variable). Recently, a tool in this vein has been made available to Czech National Corpus users via the SyD application: a map summarizing the proportional usage of a given set of variants across the traditional dialect regions of Czech represented in the ORAL series corpora. The advantages of this new feature are discussed and examples highlighting how it can give an intuitive overview of dialectal variation are given. Current and future plans for other useful types of map-based visualizations of spoken corpus data are also presented.