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Les cartes sont classées en 6 catégories en fonction de son échelle :
Cat 1 : Vue d'ensemble &lt; 1 : 1 500 000
Cat 2 : Générale 1 : 350 000 - 1 : 1 500 000
Cat 3 : Côtière 1 : 90 000 - 1 : 350 000
Cat 4 : Approches 1 : 22 000 - 1 : 90 000
Cat 5 : Portuaire 1 : 4 000 - 1 : 22 000
Cat 6 : Amarrage &gt; 1 : 4 000 
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