Kystverket is a national agency under the Ministry of Transport which is responsible for the safety of maritime transport, its development and marine infrastructure. One of its tasks is updating nautical charts in cooperation with Kartverket – the agency responsible for the geodetic data. Charts are available free of charge on the websites of both agencies: kart.kystverket.no and www.norgeskart.no.
To enable nautical layer on kystverket.no site, select in the lower left corner “Bakgrunnskart” and “Sjøkart”. On norgeskart.no go to options on the left and select “Kartvalg”> “Sjø”> “Hovedkart.” Both charts are exactly the same but available options vary.
Among the features there is ability to measure distance and area, display weather data, AIS readings, etc.