[time-nuts] question about Thunderbolt geo acuracy

[Jim Lux]

On 5/10/12 6:42 AM, mike cook wrote:
> A man with only one GPS ........
>
> Surveys from different receivers I have. All taken at the same height
> from prolonged surveys. WGS84 datum.
>
> Oncore UT+ A 207,62m
> Oncore UT+ B 209,24m
> Z3801A 180,72m
> Oncore VP A 229,95m
> TBolt 207.00m
>
>
>
That's a pretty big variation (10s of meters), a lot more than I'd 
expect (I'd expect variations more like the difference between the two 
UT+s and the Tbolt).
I wonder what about the VP and Z3801 fixes pushes them so far away.