Norwegian Hydrographic Service, 50m grid in UTM33 converted to geographical coordinates
Multibeam surveys by Norwegian Hydrographic Service until February 2016 gridded to 50*50m in UTM33 (north Norway) or UTM32 (South Norway) with Euref 89 as datum. Data established whithin 30*30 minutes cells but tiled into 2*2 degrees tiles. Data extends up to 78,5 degrees N.