The Nederlandse Onderwatersport Bond, (NOB) is the national governing body for recreational diving and underwater sports in the Netherlands.
The NOB is a member of CMAS Confédération Mondiale des Activités Subaquatiques.
[4][5] The NOB offers training with particular attention to the difficult dive conditions encountered in the Netherlands (currents, limited visibility, cold water).
The Docent and Master-Instructor are the two highest levels of instructors within the NOB[dubious – discuss].
Given the stringent selection process, based upon application and approval from the board of directors, very few NOB instructors reach this level of certification.