[time-nuts] nuts about position

[Mark Sims]

The typical receiver default self-surveys of 30 minutes to 2 hours are not ideal.  They will not include a lot of satellites or the effects of multi-path over time.   A survey of at least 12 hours is needed to include all the sats.    24-48 hours is even better.

The effects of things like antenna position changing a couple of cm due to expansion and humidity effects are swamped by the receiver accuracy and noise.

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>  That said, there are certainly a lot of issues with how the self-survey
position should be calculated *and* maintained, because it really needs
to change over time for optimal performance.