It is customary but not mandatory to tip the captain and mate on any charter you take anywhere around the world. Typically 20 percent is going rate. Captains do a lot of behind the scenes work to ensure boats; trucks, trailers, and gear are in tip top shape to perform their job. Nothing that has to do with boats and fishing is cheap. Captains and I especially spend a lot of time and energy to ensure we have proper baits and gear for the next day and morning of so I can deliver the best results possible.