1. Drawing upon his knowledge of the sea from years as a sailor, he positioned the ship dead astern to the setting sun, ensuring they were sailing due west.
2. In the thick sea fog, the only reference the skipper had was the lighthouse; it was dead astern, and he planned to keep it that way for as long as possible.
3. The pirate ship was positioned dead astern of the merchant ship, preparing for an attack.
4. Despite the choppy seas, the seasoned captain managed to keep the menacing thunderstorm dead astern, successfully evading the worst of the weather.
5. As the coast guard ship turned to follow, the fleeing vessel adjusted its course to have the pursuers dead astern, intending to use the sun's glare at sunset to gain advantage.