How physically hard is Navy OCS?

Here is my background: I have done Marine Corps OCS twice, making it 7 weeks the first time and 9 weeks the second time. The physical part wasn't too bad, except for the hiking. I have really flat feet, so I get shin splints. I could still run, but the hikes with all that weight were too much. I was dropped from the program because I couldn't finish the hike. So if Navy OCS is a lot of pushups, crunches, pullups, running, etc. I should be fine. I just want to know basically if there is anything that compares to a Marine Corps hike.