You really need to learn the area that you are planning to fish. Charter a known marlin capt. in your home waters. If you are going to chase Marlin you better have a fat wallet, so may as well hire a good captain to show you the way the fish in your region act. Everywhere is different. I have been on several marlin trips around the world. In New Zealand, they chase em totally different, than in St. Maarten or Puerto Rico, then in Texas the structure is oil platforms, but like 1/2 mile from them?