Smedley

The nav system on my new AVIC-8100NEX displays the wrong speed limits for just about every road. Here in the San Francisco bay area, it says that 101 and 280 are 50 MPH, when they are both actually 65 MPH. Highway 17 is indicated by the nav as being 55 MPH but is actually 50 MPH. Surface streets are often shown as 25 MPH when they are actually 30 MPH or 35 MPH. Is there any way to correct these, or is it just erroneous data in the navigation database?