Muy interesante. #Carta de hielo en el #hemisferio norte. #Cartografía. Año1946

"Published by the Hydrographic Office, US Navy, Washington DC".

En el mapa se reflejan 5 tipos distintos de hielo y en la leyenda los describe de la siguiente manera:

-Permanent polar pack, inaccessible to navigation.

-Unnavigable sea and land-fast ice, occasionally penetrable by powerful icebreakers.

-Generally unnavigable sea and land-fast ice. Ice-breaker assistance normally required, although at times penetrable by heavily built vessels.

-Sea and land-fast ice generally navigable by heavily built vessels.

-Sea and land-fast ice generally navigable by unrein-forced vessels.

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