Police are investigating criminal damage caused to a boat moored off the coast of Haverigg, near the Harbour Lights caravan park.
It happened sometime between May 25 and June 15. Damage was caused to a window, valued at £1,000.
Officers are keen to hear from anyone who has information, particularly any dog walkers or anyone else who may have passed at the time and saw anything suspicious.
Anyone with information can report online at www.cumbria.police.uk/report-it, quoting incident 33 of June 15, for the attention of PC 2642 Rebecca Clark. You can also phone on 101.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.