 NSAR, Inverse Synthetic Aperture Radar, is a powerful tool used to measure ice velocity in Antarctica. However, its accuracy can be affected by calibration uncertainties and lack of basic data. This paper presents a new method for calibrating and mosaic-ing NSAR measurements from multiple satellites, reducing measurement uncertainties and improving the accuracy of the final product. Additionally, this paper demonstrates the importance of understanding the calibration process when using NSAR data, as it can affect the reliability of the final product. This article was authored by Bern Schuchel, Eric Rignott, and Jeremy Mujanot.