GPS to make speed limit

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i planning build electric go-kart grand children, (check thread)
http://elektronikforumet.com/forum/viewtopic.php?f=3&t=75450&start=0 (sorry in swedish)
but 5 years old want limit speed in way adjustable better drivers daddy can increase maximum speed.
my idea use gps-module on arduino uno , use speed parameter (if internet survey right) directly module not have clue on how find signal in sketch.

this not first arduino adventure.
i have made simple sketches before book "franzis arduino tutorial kit manual".

i have working arduino uno in car reads lambda signal , converts various light in rgb-diode. 2 lambdas lights blue , green part of diode, red used purpose.

jörgen

i wonder if easier put detector on drive shaft , control max rpm of wheels. think give more immediate feedback gps.

a simple reflective optical detector , few spots of white paint on drive shaft may sufficient - 4 pulses per revolution?

...r


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