Eiichiro Oda has established a certain pattern in One Piece, which clarifies why Zoro keeps getting lost without a certain person.

Zoroās zero sense of directionĀ is a common gag trope inĀ One Piece, but it has a pattern, which has been established by Eiichiro Oda since the very beginning of the story. Zoro is so ātalentedā that he can even get lost in a straight corridor.
Yet, his directional mishaps have a deliberate pattern that serves a huge narrative purpose, while also adding layers to Zoro himself. Despite being one of the most formidable Straw Hat members, Zoro finds himself receiving flak for being directionally challenged, but this has been the case from the start.
Zoro Was Directionless inĀ One Piece From the Very Beginning

According to a theory byĀ manganimist on Instagram, Zoro is a person who fundamentally needs direction in his life. He has been lost from the very beginning of One Piece. By the time he was 8 years old, Zoro had already lost both his parents, and the only thing that he pursued was training to be a swordsman. He had no goals and no purpose until he realized what he wanted to be: a master swordsman.
Once Zoro learnt about Dracule Mihawk, who held the title of the greatest swordsman in the world, he set off to the sea searching forĀ Mihawk so he could challengeĀ and defeat the title holder. He had no idea where to go and ended up getting lost again. A dream without a direction is ultimately pointless.
He might have had a lofty goal, but he had no idea how to reach it. That is, until he met Luffy. Luffyās dream was just as lofty as Zoroās, if not more. However, Luffy challenged the world as if his becoming the Pirate King was something that was bound to happen. He is unshakeable in his resolve. It was Luffy who gave Zoro the direction to pursue his dream of becoming the greatest swordsman in the world.
Eiichiro Oda Establishes Zoro Is Lost Without Luffy

Once Zoro realized that Luffy was deadset on being the Pirate King, he also locked onto his own dream. The Pirate King deserves no less than the best swordsman in the world in his crew. Thus, Luffy is the thematic compass for Zoro, someone who has never had direction in his life.
Every time Zoro gets lostĀ inĀ One Piece, he is without Luffy. This might be because this separation renders him unable to comprehend directions. In fact, during the Syrup village arc, both he and Luffy were lost, trying to look for the āNorthā direction, that is, until they both got together. Both of them reach Usopp and Nami at the same time, after getting lost.
After this arc, every time Zoro wanders away alone, he ends up getting lost. This seems to be a clear indication from Eiichiro Oda. Zoro will always be lost without his captain, both in his life and on the roads.
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