Hello

A bit long winded but I would not use 'free movement ' or the right to circulate here'

That is also a correct translation but for people on special visas.

In this case, it would be wrong in my opinioin

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Note added at 52 mins (2013-01-16 08:47:42 GMT)
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or possibly the same but ending with

....in their jurisdiction of their duties

Though each state has its own process and name for this document, I would say that this is understood by all.

Avoiding the question of the exact document that shows they have such authorisation. It could be a badge a card or a piece of paper.
See p10, para. 36 of www.dft.gov.uk/mca/twg_paper_45_-_port_state_guidelines-2.p...

"Les personnes titulaires d’un titre de circulation national (inspecteurs et contrôleurs de l'inspection du travail, fonctionnaires et agents publics exerçant des missions d'évaluation ou de contrôle en matière de sûreté ou de sécurité) sont autorisées à accéder aux installations portuaires sur présentation de ce titre."

here we are talking of fonctionnaires / civil servants and others employed by the State and authorised to conduct various forms of inspection/control (employment laws, Health and Safety, Security etc...) on the whole of the national territory i.e. the whole of France.

This needs to be specified as not all inspectors have the authority to act anywhere in France - an inspector employed by the town of Paris has no authority to inspect anything outside of Paris: "Les Inspecteurs de Salubrité" acting on behalf of La Mairie de Paris would be instantly told off if they tried to inspect anything outside the territory covered by La Mairie de Paris.

Here "de circulation nationale" doesn't mean freedom of movement, as it would mean for any resident of France, but competence/authority of a state agent on the national level - anywhere in the whole of France.

"Titre" is their professional ID, some kind of ID card proving what is their function at national level.

"warrant card" in UK is a professional ID for police officers but also for customs and others, showing that they have some specific powers/authority - looks like the nearest match here.

[http://en.wikipedia.org/wiki/Warrant_card]


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Note added at 6 hrs (2013-01-16 14:17:49 GMT)
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HM Customs and Excise: "A current valid UK Police, HM Immigration or HM Customs warrant card...
[http://www.baa.com/static/ID_Centre/Downloads/PDF/Form_8.pdf]

UK Border Agency: "...The new warrant cards and wallets, with die cast metal badges, will be ..."
[http://www.policeoracle.com/news/new-warrants-for-ukba-offic...]

"The language on a warrant card usually indicates that the holder is granted authority by a specific official to perform the functions of the office held, and may also indicate training to a particular level."
[http://en.wikipedia.org/wiki/Warrant_card]

The same approach applies to other authorities with similar powers to intervene:

"This is a consolidation of the Brucellosis in Cattle (General Provisions) Orders, 1991 to 2009,

Article 22 Production of warrant cards etc.
....
Article 22

22. Where a veterinary inspector, an authorised officer or an officer of the Minister mentioned in either Article 5, Article 8 or Article 9 of this Order takes a sample, applies a mark, takes possession of a reactor or makes a demand pursuant to this Order, he shall, if requested, produce his appointment or authorisation for examination by the person concerned.

[http://www.agriculture.gov.ie/media/migration/animalhealthwe...]

Someone who has authority to just walk in in any port in France and access any part of the port would have credentials of the level of a “warrant card”.