Looking for the movie title of a thriller from the 1970ies

Hello movie fans, I have been looking for a Thriller film from the 1970ies (or 1980ies). So my memory may be off in some aspects but this is what I think I remember The protagonist is an engineer or a mathematician who possesses some valuable information (formula, or equation). He is chased by some larger entity, a company, or a group of men, who want that information. I also remember that there is a woman who helps him throughout the movie. I also remember that it ends with the protagonist getting on a boat or ferry to flee from the situation, an act that was arranged by that woman. I would appreciate all kids of hints or guesses or the title. Thanks!!!