Jamaica
Form requiredYou need to fill in the Online Immigration/Customs C5 Form online before you arrive. It's free on the official site.
Open the official formenterjamaica.gov.jmWhen to submit: Can be completed up to 30 days before arrival.
Visas and travel authorizations depend on your nationality, so check those separately.
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Official site says all passengers must complete it before travel; UK FCDO says complete it online where possible.