G Series speed data input

Hi, can you please let us know if there is an option to set the speed display on the data bar of my G Series to show speed calculated by the internal gps sensor of the G Series system, rather that what it currently shows which appears to be the speed log from the paddle wheel that's connected to the ST-60.
Thank you.

  IMG_1748.JPG (Size: 61.96 KB / Downloads: 1)

  IMG_1747.JPG (Size: 34.41 KB / Downloads: 1)