How can you make a signal fire if you find yourself on land after a shipwreck?

Using dry wood and natural accelerants is the most effective method for creating a signal fire after a shipwreck. Dry wood burns more efficiently, producing a steady flame and significant heat, which are crucial for signaling and ensuring visibility. Natural accelerants, like dry leaves, grass, or pitch from trees, can help ignite the fire quickly and sustain it longer, making it easier to create a noticeable signal for rescuers.

In contrast, using damp wood can create excessive smoke, but it is less effective for producing a strong flame, which diminishes the fire's signaling capability. Burning plastics may yield bright flames but releases toxic fumes that can be harmful to breathe. Additionally, relying solely on items found in one's pockets would limit the materials available for starting a fire, potentially compromising the effectiveness and duration of the signal. Thus, the most efficient and safest option is to utilize dry wood combined with natural accelerants.