Ocean, where'd you get your info on the number of sats that the Acura Nav uses?
12 would not get a substantially better fix than 8 if data to them were perfect.
The militay does have an extra capability not avialble to Joe Public, and that is how that can get some more error out----but once again this is differnt than SA.
Yes, I read a review that basically describes this feature: 20-30 seconds of "dead reckoning" for the SPIII. This should compensate to some extent for the lack of gyros.oceanMDX said:When driving through the tunnel, the StreetPilot did lose heading and track (the tunnel is curved in an arc), but continued to advance the map as though it was assuming that I was maintaining my velocity.