- To overcome the disadvantages of accuracy denial.
- Systems are totally automatic.
- Improve the accuracy of the GPS fix only in areas where the system operates, typically about 200 nm.
- Additional equipment must be installed.
- position updates of 0.5 seconds reported position-fix accuracy of about 1 to 3 metres rms
- Still dependent upon the supplier of the GPS signals.
ERRORS in calculating postion by different types of equipments
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