Sony Ericsson P1i GPS

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Hello friends, I own a Sony Ericsson P1i phone without the in-built GPS receiver; however it is compatible with the GPS. I am planning to buy an external GPS receiver, which can be connected to the phone via bluetooth.I am curious to know if someone has tried this. Will it affect the battery life? Or most importantly, will it be tedious to use two gadgets at a time? If so,I would plan to buy a phone with in-built GPS. Thanks.