Well, might have been sailed before, I have no idea. I was there yesterday, and should have gone out, it looked great, but after being bogged had to get back to Strahan (see hazards of work thread). Line on map is 1.5Km, and reckon this channel would work in W to SW to S, at low tide sandbar is exposed, and mirror flat water.
Hope I haven't exposed someone's secret spot - but doubt it.