"Seafarers are lonely, they feel isolated," says the Rev Howard Drysdale, who works as a port chaplain in Scotland's busiest port, Aberdeen, with the interdenominational ministry Sailors' Society.
Around 90 per cent of the goods imported into the UK each year arrive by ship, but with modern ports being far more removed from towns and cities, the hard reality of a life spent at can be easily missed.
The average seafarer spends six to nine months, sometimes even a year at sea, often with no means to communicate with their families.
Their needs when they arrive in port can be as varied as the weather out at sea, meaning that the port chaplains have to be ready for anything.
"A typical day? I'm not sure we have such a thing as a typical day!" says the Rev Andrew Huckett, a port chaplain in Southampton with the Anglican seafaring ministry, Mission to Seafarers. "Seafarers have many different problems. They have no social security, they don't have free healthcare. It can be anything."
At the port chaplain's centre, seafarers will find free access to the internet, phone cards, DVDs, a fresh stock of reading material and that all important sympathetic ear from the port chaplains.
In times of greater need, port chaplains may be called upon to help seafarers who have found themselves on the wrong side of the law, in hospital, or in jail. Very often, it is the port chaplain who will visit them until they are out again. And when seafarers die unexpectedly, port chaplains are there to break the news to family members.
Whatever the need, port chaplains are used to being called upon at times of crisis.
"You have to be very flexible because no two days are the same. No two gangways are ever the same. You never know what you will meet at the other end of the gangway," says Drysdale.
With ships sometimes docked for only a few hours, it is vital that the port chaplains gain the trust of the seafarers in a very short space of time.
"The seafarer doesn't have lot of time when in port and he has to know who to trust," says the Rev David Potterton, Principle Chaplain with Sailors' Society. "One of the things that the chaplains enjoy is a trusted status because we are seen to be men and women of faith. Even for the Muslim, that has real currency with them and they respect that."
That trust has been built up over many years of Christ-like service to seafarers of all faiths in ports across the world. Some locals see the docked ships as an opportunity to make some money by going onboard to sell their goods and wares, but chaplains are different. Their primary concern is the spiritual and physical well-being of the seafarers.
"Everyone's trying to get something from the seafarers. But we are trying to give something to them," says Drysdale.
Potterton adds: "Most go onto ships selling things but we go onto the ships and we don't sell anything and that just opens up so many opportunities. It is a genuine expression that we are there for the seafarers."
Sometimes the challenges seafarers face are related to the ship itself. Whilst most of the 40,000 vessels sailing the world's seas today are operated by reputable companies to high standards, there are still some ships sailing that are not seaworthy.
"Sadly ships do sink, and lives are lost, but seafarers are willing to take the risk because they need the money," says Potterton.