(a) A branch pilot may appoint two deputy pilots, subject to the examination by and approval of the pilot board of a navigation district.
(b) The branch pilot may appoint an additional deputy pilot if the pilot board considers the appointment advisable.
(c) The branch pilot is responsible for the acts of the deputy pilots.
(d) The branch pilot's own appointment under this chapter is forfeited if the branch pilot appoints a deputy pilot without the pilot board's approval.