I'm aware there are no ferries. Itvwas moren a funny glitch that G Maps show this and in the point to point navigation tells me to take the ferry from Hua Hin beach, the main access in town
I had a very similar problem just over a week ago when routing from Hua Hin to Korat. Google Maps said take the ferry from Hua Hin to Samut Prakan. Obviously there's a gremlin running around inside Google Maps.