I believe the mobile Tom Tom maps are a separate download from the ones you use in your standalone/car unit. You might check on the Tom Tom DVD install if anything is present for mobile devices. FWIW, I sometimes use Tom Tom 6 on my ATT Tilt (no longer have the original DVD). Hopefully it's compatible with the BJ too. Here's a site you might use-
http://www.filesaveas.com/navigator.html

Unlocking the GPS receiver-

http://www.intomobile.com/2007/11/26/unlock-your-samsung-blackjack-iis-integrated-gps-receiver-to-work-outside-of-telenav.html

Also-
http://www.myblackjack2.com/hacks-and-mods/application-unlockers/modaco-gps-hack/

Once that takes, the GPS should work with third party programs such as Google maps, Microsoft Live Search and Garmin.

Here are some additional resources on using your Blackjack/GPS/WM6, etc.

http://forums.wireless.att.com/cng/board?board.id=samsung

http://howardforums.com/forumdisplay.php?f=376

http://forums.wmexperts.com/forumdisplay.php?f=137

http://howardforums.com/forumdisplay.php?f=178

have fun,
Pedro