Thought I'd mention this since others may be interested. The Edridge folks have made the tide and current data available online:
The map "player" is a free with download including a sample map but you pay ~$20 for each region. It includes all the tide/current data from the book. The really cool stuff is that you can run the current/tide models graphicaly and get real-time display of how the currents move in relation to the rising and falling tides at the respective stations. I'm still trying to reconcile my memories with what the models say happens at the Monomoy Rips - I of course defer to Capt. George W. Very cool stuff!
My only gripe is that they put a chart boundary at Block Island which meant I ended up buying two downloads to cover the cape and LI Sound.