Fire crews will take part in a fake emergency onboard the Manannan next week.
A practice exercise will take place in Douglas Harbour on Monday evening.
Firefighters will be mobilised to the boat and will simulate extinguishing a fire on board with the assistance of the ship’s crew.
Steam Packet Chief Executive Mark Woodward says: “We want to advise the public to avoid any confusion for anyone who sees the emergency services attending Manannan.
“This type of exercise is something we plan for from time to time and is both beneficial to the fire service and our crew.
“It further cements our relationship with the local emergency services, allows them to familiarise themselves with the craft and improves our staff’s understanding of the requirements of the fire service.”
The scenario will be based around a car deck fire with a trapped or injured casualty and is expected to take around two hours.