An updated accumulation map for the Greenland Ice Sheet for the period 1971--1990, based on kriging of accurate point estimates developed during the past decade at over 40 points plus over 200 historical points, shows an average water accumulation of 30 g cm-2 yr-1. Average uncertainty (standard deviation) in estimates of point accumulation for the interior part of the ice sheet, where the kriging drift surface is well constrained, is approximately 7 g cm-2 yr-1, or 24% of mean accumulation. Because there are multiple cores in most regions, the regional uncertainty in accumulation should be considerably lower than the 7 g cm-2 yr-1 average uncertainty at a point. There are still many areas on the ice sheet, including northwest and southern Greenland, where annual accumulation remains poorly constrained. ¿ 2001 American Geophysical Union