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I decided to try to find out how accurate the speedo is on the Antara.
There is a speed warning sign not far from me where it tells you if you have gone over the speed limit. I already knew you had to be doing more than 60 for the sign to flash its warning, but I wanted to know exactly how fast you could be going according to the Antara speed before the sign was activated.
So I got out my portable SatNav, which includes a current speed display, and drove passed the sign doing 60 according to the Speedo. At this point the SatNav was jumping between 56 and 57.
Next I drove passed the sign and set the cruise control when the speed was showing 60 on the SatNav, and this time the speedo was indicating just a bit less than 65. So these 2 readings match each other with the actual speed of the car being about 3 or 4 mph less than the the Speedo was displaying. The sign did not indicate I was speeding.
I made one more run passed the sign with the speed set to 63 according to the SatNav, and this time the sign flashed me to slow down
As a second verification of these figures I checked the speed indicator from my in-carvideo camera, which is also GPS enabled,and it matched exactly the speed indicated by the portable SatNav.
I can say I was not particularly surprised by these figures as most, if not all, ofthe cars I've had have shown a similar discrepancy between the real speed and the speed indicated by the speedo.
So the question now is, will I push the speedo that bit further round the dial, or will I still set it exactly on the 60 mark? Perhaps our ex/police members could comment on the calibrated speed of police speed traps and whether they are likely to be nearer to the GPS speed or the speedo speed.
Edited by: Inchindown
There is a speed warning sign not far from me where it tells you if you have gone over the speed limit. I already knew you had to be doing more than 60 for the sign to flash its warning, but I wanted to know exactly how fast you could be going according to the Antara speed before the sign was activated.
So I got out my portable SatNav, which includes a current speed display, and drove passed the sign doing 60 according to the Speedo. At this point the SatNav was jumping between 56 and 57.
Next I drove passed the sign and set the cruise control when the speed was showing 60 on the SatNav, and this time the speedo was indicating just a bit less than 65. So these 2 readings match each other with the actual speed of the car being about 3 or 4 mph less than the the Speedo was displaying. The sign did not indicate I was speeding.
I made one more run passed the sign with the speed set to 63 according to the SatNav, and this time the sign flashed me to slow down
As a second verification of these figures I checked the speed indicator from my in-carvideo camera, which is also GPS enabled,and it matched exactly the speed indicated by the portable SatNav.
I can say I was not particularly surprised by these figures as most, if not all, ofthe cars I've had have shown a similar discrepancy between the real speed and the speed indicated by the speedo.
So the question now is, will I push the speedo that bit further round the dial, or will I still set it exactly on the 60 mark? Perhaps our ex/police members could comment on the calibrated speed of police speed traps and whether they are likely to be nearer to the GPS speed or the speedo speed.
Edited by: Inchindown