I am interested in everyone's thoughts on this issue:

When you're travelling alone or with a spouse/friend, and undertaking a variety of outdoor activities, what's the most effective way leave word with a responsible third party so that you will be missed in a reasonable time frame?

As the story above illustrates, two weeks is far too long a period to drop off the grid. 24 hours is better if you're in real trouble, but perhaps that's not practical.

I'm curious how the rest of you do this.