In case GPS fails or you are not in a wireless zone, you should always have for your trip. *

What a backup plan that you have created in a event you encounter a situation

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The ieee 802.11: defines standards for wireless local area network (wlan) communication protocols. identifies various computers or devices connected to a network. verifies any resource attached to another computer on a network that is different from the computer to which the user is logged on. connects multiple local area networks (lans) and wide area networks (wans).