[time-nuts] question about Thunderbolt geo acuracy

mike cook michael.cook at sfr.fr
Thu May 10 14:04:59 UTC 2012


Le 10/05/2012 15:51, Jim Lux a écrit :
> 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.
>
>
May have an explanation for the Z3801A fix. I have just seen in my 
notes  that the Z3801A was displaying MSL and not WGS84 .
>
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