I always travel with a GPS so to be honest I've never had to use it. But the day you need them. They're great, they're in everything - not just tree bark, they're sharp enough to pierce even thin branches on bushes, and they reflect flashlights and headlights VERY clearly. If you are a trekker they are the perfect breadcrumb trail. They're very light and fairly cheap, so this is a good emergency item that's easy to keep in your backpack during the day.
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