but moderate. Rainfall is around a year and temperatures are steady throughout the year. Snowfall can occur in summer. The cold and wet summers help preserve glaciers. Although the area around the town is well-forested, exposed areas at some distance from or altitude above it have a sub-Antarctic climate typical of tundra, which makes the growth of trees impossible. Tourism Tourism is one of the main economic activities of Puerto Williams. Most lodgings for tourists are hostels. Several trails for multi-day hikes and back-packing trips have been developed in the Dientes de Navarino mountains south of Puerto Williams. A five-day hiking circuit passes around the jagged pinnacles known as the Dientes de Navarino. The trail passes peaks known as Cerro Clem and Montes Lindenmayer, named in 2001 by the Chilean Ministry of Natural Resources for the author of the Lonely Planet guide. Remains of Yahgan Indian campsites and fishtraps can be found along the coast east of the city. Puerto Williams is home to the Martin Gusinde Anthropological Museum, which depicts the lives of both the Yahgan (or Yámana) and Selk'nam peoples, who were indigenous to Tierra del Fuego. For easy exploration of some of the subantarctic forest, the Omora Ethnobotanical Park is five kilometres down the road to the west. Transport Access is by daily air service from Guardiamarina Zañartu Airport provided by Aerovías DAP or by the weekly vehicle ferry, Yaghan, from Punta Arenas, to the north. There is no formal public transport service, but an expensive transfer is possible using smaller boats to Ushuaia on the main island of Tierra del Fuego, in Argentina. Naval base Puerto Williams is one of the principal naval bases of the Chilean Navy. The base is used as start point for patrol, reconnaissance missions, and rescues in the areas of Beagle Channel, Cape Horn, Drake Passage and the Antarctic Peninsula. The Chilean Navy operates Guardia Marina Zañartu Airport and the Naval Hospital of Puerto Williams in Puerto Williams. Navy personnel make up a considerable portion of the population, although their numbers have decreased in the 21st century. The following patrol boats and ships are stationed at Puerto Williams: PSG Sibbald PSG Isaza LSG Hallef LSG Alacalufe PM Puerto Williams The bow section of the Yelcho, the tug used by Luis Pardo in the 20th century to rescue Ernest Shackleton's men stranded on Elephant Island, has been installed at the front of