There isn't much left to see at Wn81 Grandcamp, and what remains is now largely covered over by modern sea defences.
The key build here is a special construction Doppelschartenstand - a double embrasure casemate which would allow the 5cm KwK gun positioned inside to fire along the shoreline and beach to the west towrdds Wn82 and east to the area around the port at Grandcamp-Maisy.