Have you got the most recent version installed. Sports Tracker only just added the working map function recently. I think it's version 2.something. I just downloaded it the other day.
Even with that installed it won't use the maps you have installed on the phone unfortunately, it downloads it over the air everytime (so unless you allow it to connect to the internet you won't get the maps either). A stupid oversight on the part of Nokia, that hopefully will be sorted with the next update.