Bruce Ingle has written up a lengthy description of the new 600k route. This will be one of the most challenging NER events but also one of the most rewarding. The excellent accommodations at the Sandgate overnight control make it all worth it.
Update: Thanks to James Ingle (Bruce’s father and 600k volunteer) a collection of GPX files for GPSs have been posted to the Boston 600k info page. Remember to use these in conjunction with the official cue!
Update II: A revised 600k cue sheet was posted on the morning of 6-9-2011. This cue contains the same route as the previous cue, but clarifies & details some cues.