Grepolis ships serve different purposes: naval combat, transporting land troops and founding new cities. Build them in the Harbour and check their current requirements, capacity and speed in your world.
Separate combat from transport
Warships protect routes and fight enemy fleets; transports carry land units between islands. A transport fleet should not be treated as its own escort. For a colony ship, plan both naval and land protection.
Plan the voyage
Check travel time, available population and the likely response before sending a fleet. A colony ship is generally a one-use unit, so verify culture and prerequisites first. Continue with the colonisation guide, battle guide and Grepolis hub.