Before revision: Recreational divers may learn underwater navigation in stages as part of general diving skills, as in the CMAS system, or may learn it as a separate specialty course, as in the PADI system .
After revision: in the Two-star and Three-star courses,, where the training program and certification are called "Underwater Navigator"Recreational divers may learn underwater navigation in stages as part of general diving skills, as in the CMAS system, or may learn it as a separate specialty course, as in the PADI system .