At the risk of sounding like an infomercial, there is a free service called Emergency Link that allows you to sign up and put in as much information as you want so that the hospital, your loved and your friends can access your wishes. Those whom you name can be notified in case of an emergency, and medical personnel carry out what you want to have done, in case you are not conscious to tell them.
For Catholics this can be a very important service so that medical procedures will comport with your wishes. There are medical procedures that a Catholic may not wish to have performed, but unless there is someone available to convey your wishes, then medical personnel will not know. If you want a priest notified, you can add that information in. Here is how the founder of this business explains it.
If you travel a lot, or if you just want peace of mind for yourself and your family, consider utilizing this service. Or search for one like it online. You may be able to avoid us lawyers if you have such a plan in place!