So I recently got into an argument with a friend over whether or not Navigators are psykers or not. He claims that they are simply mutants, end of discussion. I counter argued that they are mutants with a developed gene that gives them psykic latent powers but that they do not manifest them in the same way that a Primaris Psyker wielding warp lightning would. Kind of the whole "all navigators are mutants, but not all mutants are navigators" theme I guess? Anyway, we couldn't agree and so I'm here to see what the larger world at large thinks.