A.T. Robertson Commentary Acts 27:2

"And embarking in a ship of Adramyttium, which was about to sail unto the places on the coast of Asia, we put to sea, Aristarchus, a Macedonian of Thessalonica, being with us." — Acts 27:2 (ASV)

In a ship of Adramyttium (πλοιω Hαδραμυντηνω). A boat belonging to Adramyttium, a city in Mysia in the province of Asia. Probably a small coasting vessel on its way home for the winter stopping at various places (τοπους). Julius would take his chances to catch another ship for Rome. The usual way to go to Rome was to go to Alexandria and so to Rome, but no large ship for Alexandria was at hand.

We put to sea (ανηχθημεν). First aorist passive of αναγω, usual word in Luke.

Aristarchus, a Macedonian of Thessalonica, being with us (οντος συν ημιν Αρισταρχου Μακεδονος Θεσσαλονικεως). Genitive absolute. Ramsay suggests that Luke and Aristarchus accompanied Paul as his slaves since they would not be allowed to go as his friends. But Luke was Paul's physician and may have gained permission on that score.