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It depends on your nationality. Driving licence fine if you are an EU citizen just need something issued by the government that's photo id eg: citizen card,driving licence.
You don't need a passport as such but you will need an identification document with a photograph. Other documents such as a driving licence may be acceptable. This is not for entry to the Channel Island but to identify yourself to the air or sea ferry company transporting you.
no
You need a passport if you're a foreigner. If you're a US citizen, you need your US driving licence.
Is very need to have your licence
Probably photographic identity such as a passport or suitable driving licence. Requirements depend on the ferry company.
The international driving permit is a translation of your licence. It needs to be presented with your full licence, whatever the issuing country. The international driving licence is just that. it is a licence in it's own right. If you have a full driving licence from a country that is recognised by the international driving permit scheme then you only need a permit.
There is no such thing as a boat driving licence
Travellers don't currently need a passport when traveling between the UK or Ireland and the Isle of Man. To travel on ferries or planes in these countries you will need ID (driving license or passport).
Check with the airline, they accept certain forms of ID like driving licence, passports are not necessary.
No.
yes everwhere you do Any EU driving licence will be acceptable for driving in Poland; for EU citizens there is no need to get an international licence.