Why do in-dash GPS not show speed?

Guest
Can anyone enlighten me as to why in-dash GPS units do not show speed but all on-dash units do? I recently did a trip to Qld and back and took along the old TomTom so I could get a real speed reading (speedo is out by ~5k/h above 100k).
 
On Mon, 15 Sep 2014 00:11:20 -0700, ross.p.tester wrote:

Can anyone enlighten me as to why in-dash GPS units do not show speed
but all on-dash units do? I recently did a trip to Qld and back and took
along the old TomTom so I could get a real speed reading (speedo is out
by ~5k/h above 100k).

Conflict with existing speedo, whose position in law is clearly defined
by cases?
 
On 2014-09-15, ross.p.tester@gmail.com <ross.p.tester@gmail.com> wrote:
> Can anyone enlighten me as to why in-dash GPS units do not show speed but all on-dash units do? I recently did a trip to Qld and back and took along the old TomTom so I could get a real speed reading (speedo is out by ~5k/h above 100k).

prolly cvan't meet the specifications needed for automobile instruments.

--
umop apisdn


--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
 
On 15/09/2014 3:11 PM, ross.p.tester@gmail.com wrote:
Can anyone enlighten me as to why in-dash GPS units do not show speed but all on-dash units do? I recently did a trip to Qld and back and took along the old TomTom so I could get a real speed reading (speedo is out by ~5k/h above 100k).

Because the vehicles speedo errs on the side of reading fast so there
will always be a discrepancy.
 

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