You create a text file and call it "cal.txt"
You put that file in the root directory of your TomTom (i.e. not inside any folder)
In that file you put four numbers separated by spaces.....
Good doggone question. After many years of fiddling with TT units, it was finally necessary to make a change to my GO 740 Live. My 'antique' GO 720 still retains its calibration without issues. The 740 had a bit of a vertical shift that was finally becoming frustrating enough to dive in and try a cal.txt file.Just out of curiosity what causes the unit to need recalibrating as it never leaves the car?
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