It was the night before Monday that the thieves raided all four piers of the boat club.
A municipal parking space for boats has also been affected.
The police have been on site and looked at the pictures from the surveillance cameras.
There you can see the thieves in full work.
- One boat has been stolen but there may be more.
Many of the owners are away over the weekend and have not looked after their boats.
It's about great value in money, says Lucy Braga, chairman of the boat club.
"Tampar cut off"
There is a large fence around the marina and camera surveillance, but none of the boat owners spent the night here when the thieves struck.
- I have had the boat's ropes cut off.
The speakers are stolen and also a petrol can with five liters.
The thieves also seem to have tried to steal the boat but failed, says Patrik Sandmark.
The boat that is suspected to have been stolen was found a bit up in Testebiån on Monday afternoon.