Veiled Vessel

You shroud the target vessel in a cloak of illusion that causes it to appear as a completely different vessel up to one size category larger or smaller than its actual size. The details of its appearance, including the color and condition of its hull, sails, oars, flags or similar insignia, and all such similar details are up to you. You also may create illusory cargo or weapons, or disguise existing weapons or cargo. Creatures aboard the ship are not changed in appearance. A creature that uses its action to examine the image can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. If a creature discerns the illusion for what it is, the creature can see through the veil.