You display UTC from the GPS100 on a DSM200 or DSM250 in the following way. Enter menu mode (press the enter key or far right button), scroll to "Favorite Screen Setup..." and press enter. Scroll to the favorite screen where you would like to view the UTC time and press enter. Scroll to "Data:" and press enter. Scroll to "Time" and press enter. Scroll to "Time UTC" and press enter. Press the back key three times to exit menu mode and return to the normal viewing mode. Scroll through your screens to the favorite screen you selected for UTC time.