A couple more links which you may or may not have seen:
http://warsailors.com/convoys/index.html
In the link below, the home page has a search function at centre left. Type in the convoy name eg. PQ 17 and click on search, a number of links will appear and a great deal of information can be found which usually includes a map showing the track/route taken by the convoy.
http://www.naval-history.net/index.htm
Here is the info given in one link on PQ 17
http://www.naval-history.net/Cr03-53-00PQ17.htm