[time-nuts] Averaging Location for Position Hold

Jim Lux jimlux at earthlink.net
Wed Sep 14 05:03:32 UTC 2011

On 9/13/11 4:24 PM, lists at lazygranch.com wrote:
> I think I mentioned this is a thread one before. If you are really interested in position accuracy, you look up a calibrated point from the USGS that you can safely and legally access, then take a reading. I say safely because many points are in the middle of the street. Legally means no trespassing or you ask permission.  My preference is to find one in a park.

Often, you can talk to the local city/county and find out where some 
accurate benchmarks are, typically on a curb.  They are used to define 
street positions and such.

May not be accurate to centimeters, and you'll almost certainly have to 
convert from some state plane coordinates.

More information about the time-nuts mailing list