If you go ...
The Patagonia & Tierra del Fuego Nautical Guide (written by Mariolina Rolfo and Giorgio Ardrizzi, third edition, published by Editrice Incontri Nautici) is the definitive reference and has a comprehensive section on practicalities for anyone seriously considering a visit. What follows are some highlights derived from our 11 months in Chile.
A visiting sailboat has to be able to cruise without outside assistance. Sailors must be able to make their own repairs to keep their boats going. Any hull material is fine, but metal hulls are the leading choice for people spending much time in the far south. A bad day on a metal boat could be a catastrophe on a fiberglass boat.
A hard dinghy can handle the abuse that comes with setting shore lines. Some kind of backup tender is a very good idea, as rigging shore lines exposes you to conditions that make it easy to lose the dinghy.