I did some testing see which is more reliable my bluetooth GPS unit or the internal one found in my 8310. I would have thought the bluetooth one would perform better especially indoors, but they seem about equal. My Nextel phone will never get an autonomous fix indoors ever. Since I plan to release a tracking application for the BB and I thought I was going to require a bluetooth unit. I am now re-thinking my position and saying an internal is acceptable as well. Can anyone comment on their experiences? Thanks.