Welcome to the forums.
I dont even know what you mean by bluetooth gps. Are you suggesting using the iphone's gps and linking with some other device via bluetooth?
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2.5Ghz Custom PC (XP) + 2.0GHz Aluminum Macbook
I'm thinking of an external gps mouse antena. The ibt-gps that I used on my 6700 locked on everywhere. Even in buildings and dense trees, I almost never needed to take it out of camera bag.