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Re the comments about heated windscreens. It may sometimes cause a gps problem. The bigger culprit though is a car with climate control and solar glass. The coating to reflect light n the IR spectrum is known to affect gps reception. There is generally an area around pd the rear view mirro which is clear and to which a GPS receiver may be added and cnncted to the mobile device.
The solar coating on many cars looks purpley blue in colour from the outside. fords have a IR Mark on the screen data
I give up.