I want to know, what's the difference between GT550WS and GT680W ? in fact i couldnt see any difference.
One more thing, i watched some movies that records by gt550ws but i coudlnt see car speed on screen. I just see coordinate and date on screen. Gt550ws doesnt show car speed ? Thanks.
One more thing, i watched some movies that records by gt550ws but i coudlnt see car speed on screen. I just see coordinate and date on screen. Gt550ws doesnt show car speed ? Thanks.