OK, that works now, many thanks.
You must not modify the paper or digital copies of any materials you have printed off or downloaded in any way, and you must not use any illustrations, photographs, video or audio sequences or any graphics separately from any accompanying text.
You could say I was modifying downloaded data, but in reality the script will just do what I previously had to do manualy within a mapping program, checking which buoys have been moved, and updating the coords. As you can imagine, this is very tedious work for a human when you consider there are about 130 of them and changes are frequent.
At the end of the day, they publish this data for a reason, so people can safley navigate the estuary, they want people to know and use this info. And to make use of it generaly involves inputting the data to a chart or device. This is just a smarter way of doing it, since I never heard of a GPS or plotter that reads MS Office files, would you trust it?
For now the script is only experimental and for personal use. I did think of sharing the data in it's more useful form, but maybe that would open up another legal can of worms, given the nature of it's use.