Covert video surveillance will be used to trap potential offenders who breach a 10mph speed limit which is coming into force on Windermere.
The speed limit comes into force next month
The Lake District National Park Authority (LDNPA) says rangers will be on duty from 29 March.
But they also say they will not "chase" lawbreakers and risk lives. Those found flouting the law could be fined hundreds of pounds.
Those caught out first time will be warned and the offence logged.
Ranger manager Sara Clarke, said: "The authority will be giving people only a limited degree of tolerance if they are found breaking the law.
"Speeding on Windermere should become as socially unacceptable as speeding on roads is with sensible motorists.
"We have various ways of gathering evidence, but people should not expect speed chases. We will follow craft at a set distance or from key locations, but will not chase offenders."
She said digital cameras and speed guns would be used to enforce the law.
In January, the Lake District National Park Authority ruled out alternative proposals to the speed limit put forward by the Keep Windermere Alive Association.
Campaigners said a formal safety assessment suggested the speed limit could be potentially more hazardous to users of the lake.