WinFrog User’s Guide - Appendix C – GPS/MX 9400
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Calculation:
Select either the Primary or Secondary radio button. Devices set to Primary
calculation are used to produce a vehicle position. If more than one positioning
device added to the vehicle’s device list is deemed as primary, WinFrog will weight
them based on the accuracy value entered. Devices with a higher accuracy values
(i.e. lower entered value) will be weighted higher.
If a positioning device’s calculation is set to Secondary, WinFrog will not use the
position data in the calculation of the vehicles’ position solution; that device’s
position will simply be received and monitored. Note that in the case of Primary
device failure, WinFrog will not automatically use the Secondary devices for the
vehicle position computation. Instead, it will start dead reckoning (if dead reckoning
is turned on). You must manually change a secondary device to primary status if you
want to utilize the data coming from that device.
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.
