How accurate and precise are Arduplane's groundspeed and heading?

@linuxguy123 wrote:

Hi people.

Assume a plane is flying in a straight line, level flight at a constant power setting. Assume that the GPS unit has a good fix on as many satellites as it needs. How precise and accurate is the groundspeed and heading in Arduplane at any point in time ?

Would the error be random or have a certain bias or distribution ?

How often are ground speed and heading updated ?

Thanks

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