Why did the traders lower the sail when traveling north?

Traders often lowered the sail when traveling north to reduce wind resistance and maintain better control over their vessel. This was particularly important in regions where wind patterns could change rapidly or where navigating through narrow passages and shallow waters was necessary. Lowering the sail also helped to stabilize the ship and prevent capsizing in rough seas. Additionally, it allowed for quieter travel, which could be advantageous for avoiding detection in certain areas.