A complete 20º x 20º scan area to cover the full Earth disk can be accomplished in 30 minutes utilizing the GMS's 100 rpm spin motion for west-east scans and 2500 steps (140 µrad each) of motor-actuated VISSR mirror scan for north-south scans. Imaging takes 25 minutes, mirror retrace another 2.5 minutes, and a spacecraft stabilization 2.5 minutes.