What problems did the explorers have while crossing the Pacific Ocean

The captain and crew had no idea the sea was as large as it is, and what they surmised to be a two or three day crossing took four months. While the crossing was long, and supplies were almost exhausted, the ocean itself was so calm that the sailors renamed it the "Pacific." The ships landed in Guam in March of 1521, where they re-supplied and set sail again.

Good luck mate:P