Cellflare uses your blackberry build in GPS device to locate your friends with an accurancy of 5 meters. info is constantly updated on the live scalable maps. Cellflare also has cool features such as geofence, when one of your contacts passes the virtual fence, you will be informed by email. notice that this freeware blackberry software will require you to have a GPS enabled blackberry, and you will need to sign up with cellflare with either a free, or a paid account

you can download cellflare for blackberry OS 4.5 or higher HERE (desktop installer)

or you can download the OTA version HERE