The GPS inside the N810 is a Motorola chip designed for A-GPS (Assisted GPS) that uses cell-phone-tower triangulation to help the GPS find its initial position. Since the N810 doesn't provide this "rough estimate" position, performance blows (this is actually a design flaw 8-( )

I am almost certain that MTK != Motorola Chipset, so your GPS might very well be much much much better than the built-in GPS. (In fact, I remember reading somewhere that the MTK unit is the only GPS comparable to SiRF III, sometimes even exceeding it!)

Martin