the volunteers of nith inshore rescue are tasked with saving lives at sea. yes, even tam the dog.etch of water where they launched the lifeboat, an estuary on the solway firth, is exposed to rapidly moving tides. this creates tidal flats, basically sand and mud that move around. they're dangerous and difficult to map. it's the second—biggest tidal range in the uk and so when the tide�*s running, you can get a bore. so a wave will come in and literally salt flats, the mudflats and the sand gets covered very, very quickly. and that creates kind of a challenge around how we navigate out of this space, because it can lead to us not being able to get to where we need to at that critical moment. and with those tidal flats changing, sometimes weekly, it's almost impossible to chart a safe route out to people in danger. but now they've got a new tool to help them out. we are about to get some help from the crew. but when we're there, we're going to get some help navigating from up there. orbiting above us. this is the european space agency's sentinel two mission. the satellites pass over