T&T: Northwest passage

[Sven]

Is the Northwest passage really open ?  I know the ice coverage maps  
shows the area north of Canada open during the summer months,  but  
does that really mean that one could motor or sail from the Pacific  
to the Atlantic above Canada ?

Assuming the answer is yes,  are the charts good enough to allow it  
to be done with some confidence in being able to avoid running  
aground due to chart errors  ?




-Sven