Geneq SXBlue II Technical Reference Manual page 37

When the SXBlue II GPS is first powered in a data collection session, it is preferable to
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allow it to track GPS and SBAS satellites for a minimum of 5 minutes (ideally 10
minutes) before recording any data. Here are a few reasons for doing this:
A GPS receiver, with a freshly downloaded GPS almanac, will track better under
o
obstructed conditions like in forestry applications
It can take up to 5 minutes for a GPS receiver to download a complete
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Ionospheric Grid from an SBAS satellite. A special feature of the SXBlue II GPS
is its ability to extrapolate the downloaded grid (see chapter 2)
For forestry applications, if SBAS visibility is marginal, it is preferable to activate
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the receiver outside of forest canopy condition, let the receiver track the SBAS
signal for at least 5 minutes, then the data collection can start
It takes about 2 minutes of GPS tracking for carrier phase smoothing to be
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effective
If doing submeter work, it is preferable to let the receiver settle (for about 15 to
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30 seconds) after a loss of position fix, prior to resume data collection.
SXBlue II GPS Series Technical Reference Manual 22