Setting off from Sheppey travelling to the south of the shipping lanes using channel marker Buoys for navigation. With viability down to less than 100 metres at some points, fog horns on ships we never saw, trusting the compass bearing from waypoints and timing distances covered. Catching first sight of the towers when we were just 200 metres away from them. On our return, having to call a ship who was out of the marked shipping channel on the VHF radio to ask if he was intending to mow us down. It was certainly a trip to remember.