Speed traps await sailors.
Speed cameras are to be used on England's largest lake to catch boat owners flouting its controversial new 10mph limit.
Video equipment, digital cameras and laser guns will be in action on Windermere, in Cumbria, to catch speeding sailors from the end of this month.
But there have been threats of widespread defiance of the speed limit, which will effectively ban water sports on the 10-mile-long lake.
Opponents claim it will cost hundreds of jobs and lead to the Cumbrian economy losing tens of millions of pounds from visitors attracted by the lake's wide range of activities.
The Lake District National Park Authority, which is behind the ban, says it will make Windermere a more peaceful place to visit and help conservation efforts.
Ranger manager Sara Clarke said: "We have various ways of gathering evidence. This includes digital video equipment, 35mm still cameras, a laser gun and written observations.
"We will gather evidence by following craft at a set distance, or from key locations. We will not put lives at risk to get evidence, but equally we will not allow offenders to break a by-law which has the support of so many residents, businesses and other lake users."
Rangers welcomed the news that a judge had slapped a £500 fine on the driver of a motor boat who broke the speed limit on Coniston in a protest against the Windermere limit.
Sara said: "We have always believed that bringing offenders to court to face financial penalties was a legitimate part of our overall strategy to help keep the lake as safe as possible and enjoyable for as many people as possible.
"Speeding on Windermere should become as socially unacceptable among lake users as speeding on roads is with sensible motorists."
There are more than 6000 boat owners registered on Windermere.
The campaign against the speed limit has attracted high-profile support from people such as former Labour sports and culture minister Kate Hoey, former Tory environment minister John Gummer and one-time England rugby captain Bill Beaumont.
And Gina Campbell, 54, the daughter of water speed record legend Donald Campbell, has said the limit is "draconian".
But the ban doesn't spell the end for water sports in the North.
Tony Kemp, of the protest group Windermere Action Force, said water skiers were looking to operate in "packs" on Coniston, Ullswater, Derwent Water and Windermere.
Chief Inspector Kevin McGilloway, of Cumbria Police, said he was confident that officers would be able to deal with speeders, although the issue was low on the force's list of priorities.
Silverstone, Brands hatch, Donnington/Mallory Park's to be 'targetted' next ??
Grand National, Derby ??
Not to mention 'Speed Skating' at Nottingham Ice Stadium !
Stock Car Racing !
The list goes on.