Based in La Cruz de Huanacaxtle on the Nayarit side of Banderas Bay rather than in Puerto Vallarta itself, which puts them closer to the Marietas and to the bay's northern shore where the humpbacks tend to be.
Their whale trips from December to March go out with a biologist aboard rather than a boat captain alone, and they publish what they record. They also dive Los Arcos and the Marietas and run snorkelling for non-divers.