Why does my Order say that CoU is not available?
Check the date on which you created the original Order. If you created it after the last set of CoU was released but before the next set of CoU is released, then you already have the latest version of the data. If a release of CoU is imminent, you should wait until after the release date, and then check your data order for the availability of CoU.
I have downloaded CoU for my area, but having applied it to my existing data holding, nothing looks different. Why is this?
Not every feature changes every time a Change-only Update is released. It may be that none of the features in your data holding have been updated this time. It is not possible for EDINA to determine exactly whose orders contain changed features.
You may also find that there are some small changes to the attributes for your data. These are harder to identify if you are simply looking for changes visible on a map. It isn’t necessarily the geometry or position of a feature which has changed. When you plot the changes on a map, you may not see them, because the changes may relate to data in the attribue table.
Why can’t I have CoU for other datasets?
Only OS MasterMap data offers Change-only Update. This is because other datasets are not structured in a way which enables CoU to be identified and extracted separately. Other datasets are also not updated so frequently.