With a decent chart, plotting tools, Eldredge, a watch, compass, knot log, and a modicum of coastal piloting and navigation skills you won't need GPS. On my first trip through the Gut -- from the Duck Island Roads to Block Island -- we had several boats approach us to ask if we knew where we were and if so could we provide a range and bearing to Plum Gut. The loran signal at Newport had dropped out and they weren't keeping a DR plot.