This document describes the design and testing of a global grid of master events for waveform cross correlation to improve seismic monitoring capabilities. The grid uses real and synthetic master events from seismic arrays and other stations. Testing in February 2013 using 134 events found 92 matches using the grid, demonstrating its potential to detect more small events through cross correlation across the global seismic network. Future versions aim to optimize the use of real data, principal components, and machine learning to further enhance monitoring.