Two Irish Coast Guard helicopters were scrambled to investigate a transmission from an emergency beacon on a fishing trawler off the Clare coast.
The Emergency Position Indicating Radio Beacon (EPIRB) was received from the vessel on Monday night while it was 200km west of Clare.
As the fishing vessel was outside of VHF radio range, staff at the Irish Coast Guard communications centre on Valentia Island in Kerry could not make contact with the crew despite several attempts.
The Shannon based search and rescue (SAR) helicopter, Rescue 115, was tasked to investigate the matter. The Waterford SAR helicopter, Rescue 117, was also scrambled to assist by providing ‘top-cover’.
Top-cover is when an aircraft is deployed to provide radio communications and other assistance to a rescue helicopter which is too far from land or operating at too low an altitude to be able to communicate by radio with the coordination centre or a casualty vessel.
The crew of the Shannon helicopter eventually made contact with the crew of the fishing who confirmed that there was no issue.
The EPIRB device, which is now believed to have activated accidentally, was reset by the crew.
Both helicopter crews returned to their respective bases.