Spectra Precision Survey Pro v4.6 Recon-Nomad Reference Manual - Manual (Page 187)

Survey Menu – GPS Module
R-179
• Code: the receiver is calculating a code differential solution
(precision is about 1 to 10 meters).
• Float: the receiver is calculating a carrier phase differential
solution with float ambiguities (precision is typically within
0.1 m to 0.5 m).
• Fixed: the receiver is calculating a carrier phase differential
solution with fixed ambiguities (precision is typically within
15 mm).
H Precision
: displays the root mean squared (RMS) error of the
horizontal solution reported by the receiver. It is displayed in project
units.
V Precision
: displays the RMS error of the vertical solution reported
by the receiver. It is displayed in project units.
Note: This value is supplied by the receiver, and Survey Pro displays
the receiver’s value without modification. Most manufactures report
this value at the 2 or 3 sigma level. However, since different
manufacturers use different statistical methodology, it is not
necessarily valid to compare the RMS values between brands, or even
between models with different firmware.
HDOP
: displays the Horizontal Dilution of Precision. It is a measure
of the geometrical quality of the solution. DOP has no units and
lower numbers indicate better solution geometry.
VDOP
: displays the Vertical Dilution of Precision. It is a measure of
the geometrical quality of the solution.
PDOP
: displays the Position Dilution of Precision. It is a combination
of HDOP, VDOP and Time Dilution of Precision. It will always be
larger than HDOP and VDOP.