高德导航功能的起始点怎么和定位的位置不一致？

定位到了我所在的地方，是在右边那个箭头那里，但是为什么导航的起始点却在左边那里？？
我是有一个按钮，点击这个按钮后使用ios自带的定位功能定位，得到的经纬度，再根据这个经纬度调用高德的导航

 -(void)locate{
    if ([CLLocationManager locationServicesEnabled]) {
        if(!self.myLocation){

            self.myLocation = [[CLLocationManager alloc]init];
            self.myLocation.delegate = self;
            [self.myLocation setDesiredAccuracy:kCLLocationAccuracyHundredMeters];
            if (SYSTEMVERSION >= 8.0) {
                [self.myLocation requestAlwaysAuthorization];
            }
            if ([CLLocationManager authorizationStatus]== kCLAuthorizationStatusAuthorized || [CLLocationManager authorizationStatus]== kCLAuthorizationStatusAuthorizedAlways || [CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedWhenInUse) {
                [self.myLocation startUpdatingLocation];
            }
        }

    }else{
        [Util showAlertView"请开启定位:设置 > 隐私 > 位置 > 定位服务"];
    }
}

-(void)locationManagerCLLocationManager *)manager didUpdateLocationsNSArray *)locations{
    if (locations.count > 0) {
        [self.myLocation stopUpdatingLocation];
        CLLocation *currentL = [locations lastObject];
        self.startLatitude = currentL.coordinate.latitude;
        self.startLongitude = currentL.coordinate.longitude ;
        [self beginNavWithStartLatitude:self.startLatitude startLongitude:self.startLongitude endLatitude:self.endLatitude endLongitude:self.endLongitude];
    }
}

试着打开手机上的GPS，可能是定位不精确

就是你的定位与高德的不符合,或者模式是开车的?这两个问题你check