Now GPS devices are getting popular and more affordable. Ideally, when you plan a field trip, going camping or hiking, a GPS device will be very helpful in case you get lost. If you don’t have one, here are some simple steps to find north and south. You place a stick into the ground, and every ten minutes, mark the tip of the stick’s shadow, and keep doing that until the marks further away from the stick, The line from the stick to the closest mark indicates the north and south. In the Northern Hemisphere, north is at the mark end, and vice versa in the Southern Hemisphere.

Here are some compasses and GPS for sale on eBay.