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This sounds like today's weather reports, but it isn't. For some time I have been downloading the England, Scotland and Wales files from Geofabrik, and compiling these with mkgmap. Today, I have encountered a problem with sea flooding in SW Scotland/NW England. Compiling Scotland alone works fine. Compiling England has a small area of flooding around Carlisle. Compiling both together produces a very large area of flooding in both England and Scotland. Screenshots from mapsource for these last two are at http://www.rogercalvert.me.uk/OSM/england.jpg and http://www.rogercalvert.me.uk/OSM/uk.jpg respectively. My command line includes --generate-sea=multipolygon,extend-sea-sectors,close-gaps=1000,floodblocker Has anyone else encountered this? I would appreciate any ideas as to where to look for the problem. Many thanks, Roger ------------------------------------------------------------------------ Roger Calvert ------------------------------------------------------------------------