The borders of the control zones are perfect. It is, as somebody else suggested, the lake itself which is slightly offset.
We do indeed license this geographical data and the vendor has said they will correct the offsetting in this area in a forthcoming update.
There are a variety of reasons why OpenStreetMap data is not deemed suitable for our purposes; dozens of man-hours have been devoted to analysing the various sources of vectorised scenery data over the years.

I am, indeed, surprised that an inaccuracy of surface features of the order of 2 km is deemed acceptable for an otherwise great piece of software. If SD is actually paying someone to provide these data, I would seriously consider switching the provider.

And this in days where accurate terrain and cultural data is available FOR FREE just to download. I am, of course, talking about Open Street Map. The data comes vectorized in databank format. If that doesn't suit you, there are a zillion utility programs out there to modify and massage the data until you like it. What gives???

-- Chris.

It could be that the surface of the earth has been shifted 2 km to the west which would accurate aeronautical data make appear as if it had been shifted 2 km to the east. Just a thought.

Eric

But boarders of Control Zones are aeronautical datas, are't they? See the Upper picture.

I have asked the providers of our background scenery data (roads, railways, lakes and rivers) if they can make it more accurate in this area. We do not create this mapping data ourselves (unlike all the aeronautical data) so there are times like this where the limits on its precision show themselves quite starkly when compared to our aeronautical data, which is precise.

Hallo Gerhard,

yes, this is a known issue. Personally, I would like better chart accuracy, too. Particularly, since people navigating by VFR rely on such things as a river flowing through a town or a street passing a certain way. Therefore I, too, cast my vote for better chart accuracy where it matters.

-- Chris.

Hi,

what is the reason that the charts, at least from Germany, are so inaccurate? Two examples:
Ammersee: Why is the bird area as well as the control zone shifted by one or two kilometers to West?



Peissenberg:
In the chart, the Ammer rivers flows through the village Peissenberg. This is definitely wrong! It flows about four kilometers east of Peissenberg.



What is the reason for these inaccurate charts? Is there an improvement to expect. it concerns all available chart styles.
This poor chart quality is not really a help for VFR flights. Is the any improvement to expect?

Gerhard