The new Earth Gravitational Model 2008 (EGM08) was tested using a set of 1024 high-accuracy GPS/leveling stations in the Czech Republic. Values of height anomalies synthesized from the new model were compared with those derived by the combination of leveled Molodensky-type normal heights and GPS-based geodetic (ellipsoidal) heights. The standard deviation computed from the obtained differences was equal to ±3.3 cm. For comparison purposes, the previous model EGM96 has been tested with the same data set. Compared to this model, the new gravitational model fits five times better to the GPS/leveling height anomalies.