What kind of map do you have?
What you described is the case of using shift-added maps on regular GPS devices bought outside of China. Those devices sold in China will not have this problem due to additonal software. You have 4 options.
1. buy a GPS device designed for shift-added maps in China.
2. add the same software if available and supported by your device.
3. replace the firmware of your device with a Chinese equivalent if availalbe and compatible.
4. replace the shift-added map with a shift-corrected map such as Venus version of the same map.
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