When using Captain Segull charts to identify bottom structure such as drop-offs, canyons, and bottom structures, it is essential to understand how current, and temperature serve to either attract or repel gamefish in the area. I always recommend that anglers take the time to learn how to interpret satellite data. Once basic understanding is achieved, the combination of ocean and satellite data is nothing short of synergistic.
This chart may be used to locate ideal fishing locations for tuna, swordfish, and a wide variety of pelagic species which seek structure, current, and specific temperature ranges. When using the aforementioned tools to determine the GPS coordinates of an ideal fishing area. a quality fish finder will serve to provide the angler with additional information such as location of thermoclines, baitfish pods, plankton concentration, etc. The inspection of the water column is a physical procedure that one must engage in upon arrival at our pre-determined GPS coordinates.