An excellent collection of pics of nautical charts is here...@http://www.truebiblecode.com/understanding249.html
I think the most logical place is at The Strait of Tiran. I also do not believe Mt Siani is where tradition says it is Sinai Peninsula. GOD called Israel out of Egypt. I believe it is located in Saudi Arabia. B.A.S.E. or The Bible Archaeology, Search & Exploration has likely located the area of the crossing as well as the actual Mt Siani itself. Although Israel did not know the area to where they were headed Moses was no stranger to it. http://www.baseinstitute.org/index.php?option=com_content&view=article&id=52&Itemid=66