All New DB Mk9 battery rechargeable map magnifier out now
At the Start of the measured Test Distance, whether Mile or Kilometre. Line up the centre of the front wheel with the Start marker, ZERO all Displays, set the CALC setting digits to 0100, drive the set Distance and bring the centre of the front wheel in line with the Finish marker. Make a note of the Recorded Numbers now showing in the Display Windows (e.g.. 19.76 = 1976) and re-set the CALC setting exactly to the same numbers, in this example set them to
Hey presto it's as simple as that!
Installation Problems see Terratrip page.