[Roadsters] GPS speedo calibration

[RWM (Out of the Office)]

I use an HP iPaq PocketPC GSM phone with integral GPS that is similarly 
accurate, though typically indicating speed and position deviations when 
driving in  heavy truck traffic, I'm guessing that's due to multipath 
reflections. 

On a recent trip I set the overspeed alert to 80 mph -- a bit above 
surrounding traffic speed.  On arriving at the airport, I tossed it into 
my briefcase. 

All was well until the takeoff roll.  Forgetting that I had left the GPS 
function on, at about (surprise) 70 knots (80 mph) the overspeed alert 
started blaring -- and I started apologizing. 

- Bob Mann, '68 2000 Solex



Tim wrote:
> About seven or so years ago I was cruising down I94 from Minneapolis (leaving a trade show with another computer geek riding shotgun) to Madison on my way home from the trade show. My passenger had his laptop out and was running (his new toy) newly installed GPS software. I was driving (at the time)  a company owned late model GMC passenger van. My cruise control was set at around 75 mph. According to the GPS software running on the laptop, I was running 72/73 mph. 
>
> I would call that fairly accurate. 
>
> Tim
>
>
> ---- Dave Cooke <cookefam314 at gmail.com> wrote: 
>
> =============
> So, how accurate is a GPS at displaying actual speed? I calibrated my
> roadster speedo to my GPS & it showed I was consistently at least 5 mph
> below at low speeds & 8-10mph below at highway speeds.
>
>
> -DCooke
>  Lake in the Hills, IL
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