I only went through the actual narrows was when I took my asa 101 class. It was like a 2 lane highway and the owner of the boat I was driving kept say go toward the middle and honking his air horn. He was afraid of grounding and I was afraid of hitting one of the massive power boats going the other way. I remember going through the draw bridge at 50 when we bare boat chartered 2 years later. There was a current which made waiting for the bridge to open a little tricky.