If you look at the above link you'll notice a round wide open expanse of water along the Gakkel Ridge, in an area of ice concentration that is otherwise at much higher concentrations. (neven1.typepad.com)
If your four - wheel driving doesn't involve a lot of sand - dune surfing, deep clingy mud or high - speed blasts across open expanses, the base engines will do. (autofocus.ca)