Wirelessly posted (BlackBerry 8800: 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)

The problem is a conflict with Telenav. Once I uninstalled it, bbmaps gave me the internal GPS option.

Reinstalling Telenav does not appear to have broken anything and both are currently working.