On michigan state waters, which power-driven vessels are required to carry a whistle on board?

In times of less perceptibility or when a vessel operator needs to signal his intention or position a sound producing device is essential. If on state waters, Vessel 16 feet up to 26 feet long and engine power must have a whistle proficient of generating a blast of two seconds or more and audible for at least one half mile is obligatory and vessel 26 feet long or longer and under engine power must have a whistle proficient of making a blast of two seconds or more and audible for at least one mile is obligatory.If on federally controlled water, Vessel less than 65.6 feet long comprise PWCs must have a whistle or horn audible for at minimum one half mile is required and vessel 65.6 feet long or longer must have a whistle or horn and bell audible for at minimum one mile is required. 

In line with other previous and contemporaneous proposals, in 1912 the meteorologist  alfred wegener  amply described what he called continental drift, expanded in his 1915 book the origin of continents and oceans and the scientific debate started that would end up fifty years later in the theory of plate tectonics.