Wirelessly posted (9900: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8800/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102)

Go to the tallest building and try. Turn it on. Jump. It will lock by the time you hit the ground. Seriously. The buildings are the issue especially for the first lock which takes a little longer. Also hold it away from your body. Finally see my GPS tips page.