so the university of strathclyde have given us a whole load of waypoints in a file, and we literally this chart. you effectively get a sat nav for being out in the water? yeah. absolutely, yeah. lawrie, who is at the helm, has got a repeat of this screen so he can see what we can see here. before turning to space, the team tried using pictures from drones to see the tidal flats. but there is a problem — a day out on the water here is rarely as beautiful and clear as it is today. the problem that we have in the west of scotland in particular is that it is very cloudy, so you might occasionally get a cloud—free image, but they're really unusual. so we're using radar data. radar penetrates through the cloud and it gives us much more frequent imagery of the area. but it's also much more complicated to process that data. and that was the real challenge that we had here. and so it is looking, effectively, at the ground and seeing where the sandbanks are? yes, it's looking at the, "where is the water? "where is the exposed sand and mud? "where is, kind of, the coastline?" and then if we can