Good point Kukulkan

But actually my main point was actually to have "electronic multittols" if we could call it that way. In a survival situation, I want to have things that can do many many types of functions because i don't know what I will be facing.

Maybe your BOB already has a BLP, two-way comms ..etc. But having another gadget like a PSP or electronic dictionary stuffed with info is defintely a big asset.

Even if it doesn't have GPS , a PSP loaded with map images (just like pictures) lets you have a full atlas in your pocket. Not bad in a survival situation.

This idea came to me when I had to travel with a friend. In his car, he had GPS and other cool gadgets. In my car, I had map images loaded in my cell phone (with reasonably big screen) and couple of compasses. We both did OK when we split.