WTC wrote:Just out of curiosity, how on earth/sea can you police this?

Almost all small craft entering or launching in the harbour will land at the pier or slip, harbour office overlooks the harbour and cctv is installed which covers the whole harbour. Harbour master can ban the launch or landing of such craft if they contravene the bye-law in the loch and if they don't comply he can contact the coastguard or police for assistance.
It is a very small area of restriction we are talking about and most local users are easily identified, nautical publications will show the speed restrictions and signs locally will identify the area of restriction.
Maybe not right away but hopefully common sense will prevail and it will be accepted by all,
