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What does "control data" and "nav data" mean?

What does "control data" and "nav data" mean?

Honeywell IMU's are designed to support multiple applications. Many applications require data that is transmitted rapidly in order to react in real time. For example, one may be controlling a gimbal and the gimbal must be rapidly stabilized in order not to degrade image data. 

Some applications are more concerned about using IMU information to track vehicle position and orientation. These applications accept a penalty in rapid response in order to be more accurate. How to use Honeywell messages is described in both the HG4930 and i300 manuals (Pages 4 and 8 respectively).