File Description: This "freezes" all lakes and rivers (and some sea) for winter flying and means they can be landed on with skis or wheels; it is meant for low level flying rather than high level jet flights. This edition covers all of Alaska, except for the Aleutian Islands, as the worst area to do this for is a string of islands. Terrible. Fiddly. It is reversible with an "untick" in the FS scenery library. I have spent some time making sure that the sea and the larger inlets along the southern coast do not get frozen too as they stay ice-free in winter. Along the north shore I went for the peak of the winter with sea ice all the way to the permanent polar cap; this is not totally realistic as there is usually a partially open lead along the coast, but anything else would be ...... fiddly. This is really for use with Ultimate Terrain, though it will work without it. But as UT is what gets all the lakes and rivers there and in the right place it would be a shame not to be using UT. There is a blurry transition between southern Alaska and Canada so you may need the recent Canada post too.