Frequently asked questions and answers related to filling out the form can be found here
The designated passenger is a person who submits information for all passengers in the vehicle. The designated passenger will receive all of the necessary information in regard to staying in the RC at the entered contact e-mail address.
Enter the document which you will present when crossing the RC border.
*In addition to presenting passports / identity documents (for non-EU/ non Schengen citizens), when crossing the border of the Republic of Croatia it is necessary to have documentation on your person during your stay which confirms the reservation of tourist accommodation, or a travel agency voucher, or a confirmation of booking / ownership of a mooring, or ownership of real estate, or movable property, or an invitation from a legal entity, or an invitation to a business meeting.
*The form/announcement is valid if you present the passport or identity document (for EU citizens) you specified in the form when crossing the border.