XDA orbit phones

Hi all
I have been unable to get my trusty old medion PDA to find any satellites with racechrono (finds gps, just no sats yet tomtom works fine) so I am thinking about buying a an orbit 2 XDA with built in GPS. Does anyone have any experience of this ? Is it really necessary to have am external BT antenna. Im not a pro racer and not too bothered if timing is not accurate to 1/10ths of a second.

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