I note that the ship would be considered over crowded: even by modern standards, and most of the ships in the Mediterranean would be bigger than the Roman ones. Paul was an experienced traveler, and he was correct. The ship was going to be lost -- and even today, if you get caught in that kind of storm your life is at risk.
This is also an example of practical prophesy and dreams. The vision Paul had was consistent with scripture and what he had received earlier.
13 Now when the south wind blew gently, supposing that they had obtained their purpose, they weighed anchor and sailed along Crete, close to the shore. 14 But soon a tempestuous wind, called the northeaster, struck down from the land. 15 And when the ship was caught and could not face the wind, we gave way to it and were driven along. 16 Running under the lee of a small island called Cauda, we managed with difficulty to secure the ship's boat. 17 After hoisting it up, they used supports to undergird the ship. Then, fearing that they would run aground on the Syrtis, they lowered the gear, and thus they were driven along. 18 Since we were violently storm-tossed, they began the next day to jettison the cargo. 19 And on the third day they threw the ship's tackle overboard with their own hands. 20 When neither sun nor stars appeared for many days, and no small tempest lay on us, all hope of our being saved was at last abandoned.
21 Since they had been without food for a long time, Paul stood up among them and said, “Men, you should have listened to me and not have set sail from Crete and incurred this injury and loss. 22 Yet now I urge you to take heart, for there will be no loss of life among you, but only of the ship. 23 For this very night there stood before me an angel of the God to whom I belong and whom I worship, 24 and he said, ‘Do not be afraid, Paul; you must stand before Caesar. And behold, God has granted you all those who sail with you.’ 25 So take heart, men, for I have faith in God that it will be exactly as I have been told. 26 But we must run aground on some island.”
27 When the fourteenth night had come, as we were being driven across the Adriatic Sea, about midnight the sailors suspected that they were nearing land. 28 So they took a sounding and found twenty fathoms. A little farther on they took a sounding again and found fifteen fathoms. 29 And fearing that we might run on the rocks, they let down four anchors from the stern and prayed for day to come. 30 And as the sailors were seeking to escape from the ship, and had lowered the ship's boat into the sea under pretense of laying out anchors from the bow, 31 Paul said to the centurion and the soldiers, “Unless these men stay in the ship, you cannot be saved.” 32 Then the soldiers cut away the ropes of the ship's boat and let it go.
33 As day was about to dawn, Paul urged them all to take some food, saying, “Today is the fourteenth day that you have continued in suspense and without food, having taken nothing. 34 Therefore I urge you to take some food. For it will give you strength,[e] for not a hair is to perish from the head of any of you.” 35 And when he had said these things, he took bread, and giving thanks to God in the presence of all he broke it and began to eat. 36 Then they all were encouraged and ate some food themselves. 37 (We were in all 276 persons in the ship.) 38 And when they had eaten enough, they lightened the ship, throwing out the wheat into the sea.
One of the practical reasons for visions and prophecy is to give courage, and allow us to stay faithful to the plans of God during trials. This storm was enough to frighten hardened sailors. In this, the issues or rank and status disappeared. It was a prisoner, the Apostle Paul, who led them.
We should follow that example.