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Tides, Charts and Other
 
Boston Harbor Tides 
This is a good reference for tidal information in the Boston area.  
Marblehead Chart 
Closeup Chart of Marblehead, Salem and Beverly. This takes a minute to load, but this is a great online version.  
Chart Reference 
Somebody at Harvard has posted all the NOAA Nautical Charts. I don't know if it is legal, but this is a great resource!