Some of the google map for bikes is good, some not. Alas, be prepared for Massachusetts road signage (not good!
The maps most cyclists use (at least in New England) are called Rubel cycling maps -but again, be prepared for a level of detail that isn't like OS. Further, for some reason, some of these maps have become scarce recently. I'd recommend a GPS -which one? I don't know!
Cycling through New Hampshire (assuming you are going the coastal route) is fairly easy, and you can actually use the directions for the Granite State Wheelmen seacoast century:
http://www.granitestatewheelmen.org/SCC/SCC-Details.htm
Again I assume you will be cycling up the coast of Maine, which surprizingly, can have it's traffic challenges due to the main highway and the lack of bridges (bikes not allowed -at least in the southern portion, and I'll bet the northern part too!). If you go here:
http://www.maine.gov/mdot/opt/bike-faq.php
Note it says you can click on a link and provide your name and info to receive a Maine cycling map. Also, I'll recommend you do not try to cycle out of Boston Logan airport if you are flying in there. Oh yes, if you are looking for the LHT be very aware that many of the shops won't necessarily have your size in stock. Touring bikes aren't that common over here. Harris Cyclery (where Sheldon Brown used to work RIP is pretty good). Finally, if you are planning on coming over this year, I'd say get a move on. Weather up in the Canadian maritimes can get pretty fresh as you enter the Fall.
Whiskywheels or Somebuddy, or anyone is welcome to pm/email or post questions for me, and I'll do my best to help.
Google maps in America has a beta version of giving directions by bicycle. I am planning a big tour from Boston ma to Prince Edward Island in Canada, should I trust google maps or purchase a map from adventure cycling association or buy a gps and make my own way. Anybody cycled in USA and can offer any advice. Thanks
