17 so the men hoisted it aboard. Then they passed ropes under the ship itself to hold it together. Because they were afraid they would run aground on the sandbars of Syrtis, they lowered the sea anchora and let the ship be driven along.

Read Acts 27:17 Using Other Translations

Which when they had taken up, they used helps, undergirding the ship; and, fearing lest they should fall into the quicksands, strake sail, and so were driven.
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.
Then the sailors bound ropes around the hull of the ship to strengthen it. They were afraid of being driven across to the sandbars of Syrtis off the African coast, so they lowered the sea anchor to slow the ship and were driven before the wind.