yes, that lets you know that science is not their strong point.

Do any of you know how this iGyro unit works. yes I realise it takes a series of GPS position measurements, and then divides the distance change by time to get the speed.
But how often does it do it?? Is it once per second or a hundred times a second, or what???

Then does it take a time-average of speed values over a second or two and display that? ? ? ? ?

Or does it just display the highest recorded individual speed reading (in which case it is usless nonsense)???
In that case highhorse would be right: it just displays a GPS spike, it looks for the worst position error and displays fiction (but clever fiction as it's what you want to hear)