Looks like the blue line wasn't too far off,that area in the first pic must hold some nice cracker.We dived Mossel Bay point on Saturday and had some really nice vis but the cracker were on holiday elsewhere.
It is axactly 154km from Swellendam and the Cape is prox anything between 200 - 270km depends where u stay from swellendam so u looking anything between 350km - 420km fromcape town.
The turn of to Gouritz from cape town side on the N2 is 9km past Albertinia turnof.