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Hi Jeff,
thanks for that - unfortunately it doesn't update and I constantly get 0.0km/hr on the screen - even though its moving along the road. I tried inserting joy.getPosition() in place of viz.MainView.getPosition() to see whether the code in principle functions and whilst that does produce a change in km/hr when either accelerating or deccelerating, because this piece of code is looking at a difference between outputs - when the joystick is held constant; there is no difference and so 0.0km/hr appears on the screen
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