Can someone explain to me why my vehicle speed according to my speedometer and my speed according to my GPS/SatNav are out of sync by about 3 km/h? And which is more accurate? Thanks in advance.
In: Physics
Most cars read low on the speedo. They do it on purpose so if you speed by 5 km/hr you’re not actually speeding by 5. GPS is much more accurate. The speed you see on a GPS is what you’re doing and therefore what a police officer would clock you at using a radar gun.
Edit: I meant read high. If you’re indicating 60
You’re likely only doing 57-58
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