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Statistics - The Calculations window will show the results of the GPS
Calculations, including the Multi-Ref position and statistical data related to each
individual solution.
Use For Heading Calculations:
Select this checkbox if the device is to be used in conjunction with another GPS
device for determination of heading of the vessel. In most cases, only high accuracy
receivers should be used for heading calculations as WinFrog simply inverses the
individual sensors' raw positions to derive the bearing between them.
Use Elevation:
Setting the Elevation option to "On" will result in the elevation determined by GPS to
be used as the elevation of the vessel's CRP referencing the GPS (WGS84)
Ellipsoid. The height of the antenna above (below) the CRP must be entered. Do not
enable this option unless you are utilizing high accuracy (centimeter level) RTK type
GPS positioning.
Alarms:
Click this button to view and enable various GPS alarms, as described below.
GDOP – Geometric Dilution of Precision. GDOP is a numerical value that serves
as a measure of the effect of the satellite constellation's geometry on the derived
positional accuracy. In other words, the GPS receiver's measurement accuracy is
multiplied by the GDOP value to derive the overall positional accuracy of the
GPS receiver (including the three positional dimensions and clock offset). If the
GDOP mask is set to On and the calculated GDOP exceeds the entered value,
WinFrog will not compute a position solution using pseudoranges. If the
Calculations window is enabled, an alarm will sound to indicate that the GDOP
has been exceeded.
VDOP – Vertical Dilution of Precision. This parameter is also calculated from
satellite geometry and gives an indication of the expected accuracy of the vertical
component of the GPS position solution. If the VDOP mask is set to On and the
WinFrog User's Guide - Appendix C – GPS/NovAtel Con
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