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Driving 225 Mph With 60cs


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Posted

The other day I was driving down the road when all of a sudden the map pointer veers off the road and takes off across the map with the speedometer shows 225 mph! I restarted and a few minutes later it did the same thing.

 

I did a memory clear and it hasn't happened since, but anyone seen this before?

Posted (edited)

I've had max speeds posted of 194 miles per hour on my CS. Surely what is going on is a function of the definition of velocity: distance/time. And since max velocity is an instantaneous velocity, the time interval is taken to be very small (as the CS cannot do limits - if you know some calculus). Now, the time interval is surely quite accurate as it is a function of only a clock. But the distance is determined by the GPSr. And there is a large variability in the distance - that's what the accuracy circle is all about. So, if the distance used in the computation of dist/time is off by a factor or 2 or 3. then the velocity is off the same. It is probably not hard for the distance to be off by a factor of much more when it is very small. That's why the max or (non-average) velocity is so far off. I don't even pay attention to these any more. Although, sometimes, they agree quite will my my car speedometer.

Edited by mgabel
Posted

My Legend always has excessive speeds now. I can't remember when, but a few software upgrades ago, this problem started.

 

Prior to that, the max speed was usually pretty reliable!

 

Mike

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