You do not need a visa for Ireland
You do not need a visa to come to Ireland to join a ship. However, you will need a Seafarer's Identity Document.
Your exact preparations depend on your plans and personal circumstances. Some of the most important are described below. Read this information carefully to make sure you have everything you need.
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Before you travel
Check your Seafarer's Identity Document
Ensure you have an up-to-date Seafarer's Identity Document.
When you travel
Prepare for border control
You will need to prove that you have a valid reason for entering Ireland to an immigration officer at border control.
To do so, you must prove that your ship has arrived in Ireland or that it will arrive soon.
You must also provide your passport and Seafarer's Identity Document.
If you cannot satisfy the immigration officer, you will not be allowed into Ireland.
During your stay
Travel to Northern Ireland & United Kingdom
If you intend to travel to Northern Ireland, check with the United Kingdom authorities if you need a visa.
Leaving & returning to Ireland
If you plan to leave and come back to Ireland during your stay, you will have prove to an immigration officer that you have a valid reason to re-enter Ireland every time you return.
Make sure you have any necessary documents with you for your return journey, before you travel.