For centuries, sailors relied on portolan charts to navigate the Aegean and wider Mediterranean, reading winds, currents, and coastlines to find the safest, most efficient routes between islands and harbors. We take inspiration from that tradition: just as portolans helped mariners plot passages across shared waters, our work maps out low‑carbon sea routes, transparent supply chains, and long-term relationships that guide products from producer to buyer. Envisioning each shipment as a modern voyage, we use the spirit of the old portolan to navigate today’s urgent climate and trade challenges.