Mich. Comp. Laws § 31.3
The governor, taking into consideration the safety factor to be gained by the geographical dispersion of appointments, shall designate within 30 days after his inauguration, 5 emergency interim successors to his powers and duties and specify their order of succession. The governor shall cause a list of these appointments together with their order of succession to be filed with the secretary of state. The governor shall review and, as necessary, revise the designation of emergency interim successors to his powers and duties to insure that at all times there are 5 such qualified emergency interim successors. The governor shall keep the emergency interim successors generally informed as to the duties, procedures, practices and current affairs of his office.
MCL 31.3