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Backtrack machine / survival

Backtrack machine
Backtrack machine

When you are discover some remote and dangerous place,if the weather suddenly become terrible,it's impossible to go forward. You must to go back,but there is
no GPS signal,how to find the way back and retreat safely?
This instrument record direction and height of the route you have passed,and display on the screen as green line. Red dot is the point you start,green line is the way you have passed,the orange point is the backtrack point,and the red line is your way back.When you return,make sure the red line Coincide with the green line,this shows you stand on the road you come,and you will be safe.

University

Dong Hua university

Dong Hua university
Shanghai, China

Design

Dong Hua university

Dong Hua university
Shanghai, China

Ming gao Wei xian Zhang Xin fu Zhu