The performance of the Envisat orbit maintenance manoeuvre was as follows: Time Target Size Mode Nominal Size Calibrated Size 2002/12/18-23:16:56 0.0319 m/sec SFCM 0.0318 m/sec 0.0321 m/sec The overall calibration result was: 0.97 % The total fuel consumption for these two burns was: 0.1309 kg