In 2022, the National Geodetic Survey will adopt and publish two new geodetic datums that are the underlying bases for positioning, mapping, and navigation. The new datums will impact many human activities. They will have non-negligible positional effects in most of the United States, including Wisconsin. The new datums will also account for positional changes within them over time, an aspect of reality not heretofore comprehensively addressed. This brief book, of four chapters, is intended for a broad audience who seek background information on datums and coordinate systems to better understand the upcoming changes and their possible effects on work activities and products. The book is conversational and non-technical in nature.
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