Speeding on Windermere in the Lake District is now being controlled with the help of state-of-the-art marine trackers.
It has cost the Lake District National Park thousands of pounds - but not everyone is happy with the investment.
Fiona Marley Paterson reports:
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Sandy Murray, of Police Scotland, was was giving evidence at the trial of a bus driver who denies killing Ryan Baird by dangerous driving.
34-year-old Christopher Peck was involved in a head-on crash with a drunk driver. His funeral has taken place in his hometown, Workington.
The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.