A group of kayakers alerted Portland Coastguard at around 12.40pm on Sunday after one of their party fell into the water.
The group were able to recover the person to the boat and continued on their journey.
Elsewhere, concern was raised for a kitesurfer at around 5.30pm.
A check by Weymouth lifeguards found the kitesurfer safe and well.
Earlier on Sunday, Dorset Police asked coastguards to check the safety of a woman on board a boat in Christchurch Harbour following a domestic incident.
A lifeboat crew from Mudeford launched along with police officers and found the woman to be safe and unhurt.
This incident happened at around 2pm.
At 1.40pm, coastguards were alerted to a vessel with engine failure off West Shambles.
The boat, named ‘Malaro’, was then towed by a lifeboat crew back to Weymouth.
A member of the public reported two men in the water at Studland Knoll Beach calling for help.
Swanage lifeboat crews were tasked along with ambulance crews and coastguards.
The incident took place at around 4pm.
Earlier on Sunday, the vessel ‘Maid of the Harbour’ reported an engine room fire alarm in Poole Bay.
Lifeboat crews were called and the vessel was returned to Poole Harbour where it was met by fire and ambulance crews.
The source of the smoke was found to be minor. This took place at around 3.15pm.