Radio 1 DJs had to be enlisted to let a listener off Jersey know they were blocking emergency harbour air waves.
The Radio 1 DJs' appeal helped clear the airwaves
DJs Colin Murray and Edith Bowman made an appeal on Thursday for sailors to check they were not tuned to their show with the emergency channel still open.
The appeal ended five and a half hours of radio interference on Thursday.
Edith Bowman told listeners: "It's dangerous - if anyone is in trouble and needs to gets hold of emergency services you're preventing them."
Colin Murray added: "You are causing maritime chaos. So boat people of the world, stop it.
"We're a good show, but people don't need to die."
The harbour's Channel 16 was experiencing severe interference from 1100 BST.
Jersey Coastguard contacted BBC Radio Jersey to ask for their help to lodge an appeal on air.
A spokesman for the coastguard said the appeal worked and the channel was clear shortly afterwards at 1630 BST.
An "embarrassed" boat owner in a boat yard had left the emergency channel on by mistake, the spokesman said.
He said despite the interference, the coastguard would have been able to make out if someone had made an emergency call.