Boundary bearings and distances displayed in Quickmap are sourced from LINZ, and are often (but not always) survey accurate where they exist inside Survey Capture Areas (SCA). Parcels outside the SCA may be metres, or some cases even more than 100m out of position. 

The only way to be sure of the accuracy within QuickMap is to use SurveyView, which displays accuracy information along every boundary. To obtain survey accurate data over the whole country requires SurveyView and the Survey Plan expansion pack.