no1 pro- We were quite a ways east-south-east from Muskegon and south-west from Sparta. The closest town was Coopersville and we were east of that by about 6 miles. That's about the best I can do without driving you myself to the trail head. Hope it helps.
Edit: Ok, I just looked up Marne and Ravenna on google maps. We dumped at the trail head in Marne on the north side of I-96 and did not make it to Ravenna due to the trail conditions. Neither one of us were familiar with the area whatsoever (we found the trail head online and decided to give it a shot).