[time-nuts] High accuracy? GPS position

[Dave Ackrill]

Murray Greenman wrote:
> Mark,
> How do you KNOW your position to such accuracy? Is it in fact possible
> to survey your position to that accuracy by any independent means?
> 
> If, for example, you use official survey marks to determine your
> position by direct measurement, are the survey marks really that
> accurate?

Yes, I have a National Survey Bolt mark just down the road from me.

Dave (G0DJA)