The visibility heading down the Hudson River was okay. I could see the ferry traffic and kept my radar tight, but once I got the boat to where the river collides with the Atlantic Ocean, I was met with the thickest blanket of fog I’d ever seen. The 13,700-foot-long Verrazzano Narrows Bridge, just 50 yards away, was completely hidden. Then came the deep, resonating fog horn of a substantial ship heading upriver. The target on my radar took up the entire space between the channel markers. Time to move.