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| This is from a Trimble Support Bulletin:
OmniSTAR XP/HP convergence
What is convergence?
Convergence is the process that the OmniSTAR system goes through to achieve the desired accuracy. The OmniSTAR system utilizes the motion of the GPS satellites to measure the effects of the troposphere. When the receiver first starts receiving the OmniSTAR correction, the accuracy is low. Over time, the accuracy increases, or converges.
How long should I wait for the XP/HP signal to converge?
The length of time that you wait for convergence depends on the level of accuracy that you require. The accuracy value shown on the Autopilot or EZ-Steer display indicates how long the GPS receiver will take to reach the final convergence point (how accurate it is). For example, if your operation requires 10 cm (4 in) accuracy, allow extra time for the receiver to converge down to 10 cm (4 in) or less. The longer you wait on initial convergence (at startup), the better your system will perform in the field.
Convergence time also directly correlates to how many GPS satellites are in view. For example, the GPS receiver converges more quickly with nine GPS satellites in view than with only six.
The AgGPS 252 and 332 receivers with firmware version 3.56 or later achieve convergence more quickly than previous versions of the firmware. With the EZ-Guide 500 lightbar, you can change the convergence distance, or Engage Accuracy, from 10 cm–150 cm (4 inches–60 inches):
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Omni* HP accuracy
