What is the approximate difference in meters between NAD83 and WGS84 in the continental USA?

The difference between the North American Datum of 1983 (NAD83) and the World Geodetic System of 1984 (WGS84) in the continental USA is typically very small, approximately 1 meter or less. This minimal discrepancy is largely due to the fact that both datums are based on similar reference frames and are designed to serve roughly the same geographic region, making them highly compatible in many areas.

Considering the intricacies of geodetic datums, the variations usually arise from the methodologies used to define the datums rather than significant shifts in their positions. In practice, any positioning or mapping work utilizing these datums in the continental USA would yield results that are closely aligned, and users can safely assume that discrepancies in most applications will not exceed 1 meter.

Other options imply larger differences, which aren't supported by how the two datums were developed and used, as the conversions between NAD83 and WGS84 typically provide very accurate equivalence for most practical applications within the specified region.