Last year I stayed for a time in a condo on the pier just below the Maritime museum and the square-rigger "Moshulu" (condo is where you see "Chart House" on the ariel view link in above post). The downbound ships passed *really close* to the end of that pier, say about 150 feet.
So the issue isn't staying out of the traffic because that may be impossible--it's lookout, lookout, lookout. And cell phones, computers (other than live e-chart ones) texting, twitting, are all incompatible with "standing a watch".
"Every vessel shat at all times maintain a proper look-out by sight and hearing as well as by all available means appropriate.."
So please, hang up and friggin' navigate. the stakes are too high.