No wi-fi? No problem. Use these apps to travel sans service without sacrificing your safety or experience. http://on.natgeo.com/2tza7QY

No wi-fi? No problem. Use these apps to travel sans service without sacrificing your safety or experience. http://on.natgeo.com/2tza7QY 

https://twitter.com/NatGeoTravel/status/883460665289175041