A guide to reading the border between warm and cool water when tuna reports begin to cluster.
Cold-edge structure is less about one magic coordinate and more about where feed, current, and pressure settle into repeatable geometry.
Confidence rises when several independent reports describe the same species, similar size classes, and comparable water conditions within a short time window.
Map context
Every article should bridge narrative and utility. Use nearby hotspots, recent signals, and fishable status to move readers from insight to action.