[Foy]

This is really cool except that I have no idea what any of these things would look like from a satellite image.

Could you possibly have "examples" of a base camp / avalanche / etc?

I can't tell if something is an avalanche or just a river / runoff.

Best of luck finding your friends!

[emptyaccount]

http://tomnod.com/gi/peru/examples.php

[hamf]

They aren't my friends. Thought it was very sad/interesting though.