In some cases, the visibility of the way is not clear. For instance, the landscape has a few or no different landmark, you will face difficulty even if you have a road map with you. This is where a handheld GPS device is useful for various reasons. You may think that smartphones do the same work for you, as they are often used for guiding the directions. By recreational hikers, they are frequently in use for this purpose. But, GPS devices are far more durable than phones.
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