Grimaldi and Copernicus are both craters of the moon. The sea of clouds can be found at Mare Nubium Crater.
Grimaldi is 173.49 in diameter and can be found at -5.38 latitude and -68.36 longitude of the moon.
Copernicus is 96.07 in diameter and can be found at 9.62 latitude and -20.08 longitude of the moon
Mare Nubium, where the sea of clouds are found is at 20.59 latitude and -17.29 longitude.