Explosive drone boats, sea conditions and defence

How serious is the threat from cheaply manufactured explosive boats?

They pose a threat, but electronic warfare, gunfire, distance from shore and rough seas constrain their use.

Torpedo boats, submarines and missiles provide earlier examples of new threats that required a defensive response. Electronic warfare could disrupt boat control, while guns could engage boats after detection. Success in the Black Sea would not automatically transfer to the weather of the Pacific or Atlantic. Operating two hundred miles offshore creates a different problem from attacking near a coast. Ships approaching an inshore threat could also strike the supporting shore facilities, with a 2,000-pound bomb offered as an example.