As shown in FIG 2B, when an electronic device 300 is near any road side data exchange device 210, the electronic device 300 may receive the analyzed result data Ar to achieve the effect of calibrating {HEAD ~ the GPS signal} to have {TAIL ~ more precise satellite positioning} 
As shown in FIG 2B , when an electronic device 300 is near any road side data exchange device 210 , the electronic device 300 may receive the analyzed result data Ar to achieve the effect of calibrating { HEAD ~ the GPS signal } to have { TAIL ~ more precise satellite positioning }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL