Glaciated terrain can be identified using the crevasse zone feature. Skiing on glaciers carries additional risk and demands a high level of experience and skill. Crevasses are the principal danger when skiing on a glacier. In the winter, glaciers are often covered by snow bridges that can give way under the weight of a single skier.
Glaciers are moving all the time and it is not possible to ‘map’ crevasses accurately on a map. Whilst different ‘risk zones’ are defined in FATMAP, you ski at your own risk and with the understanding that crevasses may form anywhere on a glacier. Crevasses are a serious danger that carry the risk of death.