Interesting blog by Jim Hunt details conditions in NW Passage from early July on into August.

http://greatwhitecon.info/2017/07/the-northwest-passage-in-2017/

Vice Commodore, OCC 

Great drone video of Plum’s cruise through the NWP this summer. We met them in Aasiaat where they were keen to tell us that their drone reconnaissance had been pivotal in their transit.
https://youtu.be/WbepQ3jzq6E