In Assassin's Creed Odyssey, you get a Ship called the Adrestia in Sequence 1 of the story.

It is marked with the following icon the map:
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Because the map is huge it can be easy to lose track of where you left your ship. It always stays where you last left it but if you travel a lot you might have lost track of where you left the ship. If you can't find your ship anymore, there's an easy solution:

- Go to any Ship Dock (Harbor) and Call for your Ship

It will teleport the Ship to you instantly! This works at any Ship Dock, almost every region / island has one. The game just never explains this feature.

Ship Docks are marked with the following icon:
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If you remember where your ship is, you can teleport to it instantly by putting the map cursor on it. If you can't find your ship anymore call for it at a Ship Dock