If you’re considering taking a cruise then you’re not alone – more than 1.5 million Britons holidayed at sea last year and one in three of them was trying it for the first time.

More than 35 major cruiselines operate ships in waters around the world, but with some basic knowledge finding the right cruise can be plain sailing.

Most ships sail ocean or coastal routes out of major ports with itineraries lasting about seven to 14 nights. There are also shorter mini-cruises and longer and world cruises that last anything up to three months, and cruises along rivers and inland waterways.

The Mediterranean is by far the most popular destination for British cruisers. Most fly to meet their ships – this is called a fly-cruise and can be booked in one package along with flights and transfers. Fly-cruises can take you to pretty much any part of the world, and price will normally depend on the length of the flight plus the duration and standard of the cruise.

But more big cruise lines are placing ships in UK ports and sailing to and from the Med, usually in 14-day-plus itineraries, as well as to northern Europe, the Americas, the Caribbean and around the world. This means passengers avoid airports and also have relaxing ‘sea days’ at the start and end of their holiday.

Ships vary as much as destinations. The largest carry anything up to 5,000 passengers and are like floating resorts, usually with a mind-boggling array of onboard facilities. Medium-sized ships might carry 500 to 1,200 passengers, the smallest ships as few as 49.

Onboard culture varies too. Traditional cruising with set meal times is still very popular, but the greater trend is towards dining ‘on-demand’ with multiple restaurant choices and greater variety. Cruises tend to be all-inclusive so meals, entertainment and onboard activities are included in the price of the booking – although you may also be expected to tip.

There are various types of cabin - an ‘inside’ has no window, outside-view cabins have windows or portholes while balcony cabins have outside space for table and chairs. The most expensive accommodation is a suite which is larger and can have a number of separate rooms.

The best way to dip a toe in the water is to take a short cruise or to combine a cruise with a land holiday in a ‘cruise and stay’ package. Your ACE travel agent will be able to suggest suitable ships and itineraries.