Quote:
Originally Posted by DSPographer
If you check the other thread I linked above I list where I have discovered a few things. First I think the roof antenna is just for the radio: XM and FM. I think the GPS antenna is in the same place as in the Impreza- behind the head unit just under the dash. The combination of this location in the BRZ and the performance of the antenna+receiver of the GPS seems fairly poor compared with all other GPS units I have used. More info on what is going on in the nav unit can be seen in the service menu. You can get into the service menu by pressing at the same time: first the map button, then the speech command button, then the audio button and holding them a few seconds. (You go back to normal operation after shutting off the car.) From there I see that the speedo input to the nav unit reads 64 MPH when the car is really going 41 MPH. I think this error is at least a problem for the dead-reckoning the unit does when it doesn't have a satellite fix. It might also interfere with getting a GPS lock when moving if the software tries to make the fit agree with the speedo value. The poor dead reckoning could also slow down the initial lock after driving by causing the unit to start its initial guess for your location in the wrong place.
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You're probably right about the antenna.