What setting should be changed to ensure collected GPS points are imported with millimeter precision?

To ensure that collected GPS points are imported with millimeter precision, the X,Y Resolution setting should be adjusted. The X,Y Resolution defines the smallest measurement increment for the coordinates being processed. By setting a very high resolution, you are allowing for greater detail in the coordinate values, enabling accurate representation down to the millimeter level. This makes it possible to capture and work with highly precise spatial data, which is essential for applications that require meticulous accuracy, such as surveying or detailed mapping.

While adjusting the Output X,Y Domain might influence the allowable extents of the data, it does not directly control the precision of the GPS points being imported. Similarly, X,Y Tolerance refers to the allowable deviation from a point, and Coincident Points deals with the handling of overlapping spatial features, but neither of those settings affects the actual precision with which the coordinates are recorded. Hence, the right approach is to refine the X,Y Resolution to achieve the desired precision in the dataset.