Volunteer crews called out to a speedboat that had run aground in the River Exe found that there was no safety equipment on board.
Exmouth inshore D class lifeboat George Bearman II was sent to sand flats between Powderham Castle and Lympstone just after 11pm on Saturday 28 April. It found there were four people on board and one had been in the water.
The casualties were taken ashore at Exmouth Marina with the help of a local water taxi. The crew laid down an anchor for the speedboat to float itself in the morning rising tide.
The Exmouth RNLI safety officer says the casualties were lucky to be able to call for help with just a mobile phone.
The speedboat rescue was the second of three call-outs for inshore lifeboat, George Bearman II in just 24 hours at the weekend.
The crew rescued an old tender found floating down the river earlier on Saturday evening.
On Sunday evening, 29 April, the boat was tasked to help a woman having fits in the water near the Exmouth clock tower. The crew stayed with her while waiting for the ambulance.