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These days, lots of people enjoy trekking, hiking and camping.There are some problems. one of the roblems is that trekking trail or mountain, GPS is not operated well. You might be in emergency situations, have seperated from their group and get lost in the mountain and trail. Signal Tent help others easily find you and you can inform your lication and situation to others.
Sookmyung Women's University
Yongsangu,Seoul, South Korea