Emergency responders depend on real time data products such as earthquakes' locations and their magnitudes. ShakeMaps (Wald et al 1996) are also critical tools for estimating the impact of large and great earthquakes on society. These products can only be as reliable as the seismic systems which record and transmit ground shaking. We test the real time ShakeMap capabilities of the seismic networks in Northern California Seismic System (NCSS) (USGS Menlo Park, network code: NC; UC Berkeley, network code BK; the California Geological Survey, network code CE; USGS Strong Motion Program, network code NP). These networks have a large number of freefield strong motion stations; however, only about 160 of them, mostly in the San Francisco Bay Area, report data in real time. Thus only these stations can contribute to initially produced ShakeMaps.