I always leave mine on to track. I LOVE to see where and how far we've hiked or walked. (The scouts really like it too, I print maps from Summer camp and the camporees for them). If I was in an emergency situation and needed a gps I'd do the same. But unless I was kidnapped, blindfolded and dropped off in a remote location, I'm not too worried about it. I have plenty of spare batteries for a weeks worth of 12 hour days recording. Also, my GPS is just a fun thing to use. I'm still a map and compass guy at heart.