15. NAVIGATION TOOLS
15-4
How to compensate for position error
Position is caused by the following:
• Inaccurate position
• Position offset
• Inaccurate chart
• Improper installation parameters (conning position offset, position receiver antenna
offset, radar overlay range offset)
15.2.3 Error Sources for Radar Echo Image and TT Mismatch
There are several reasons why the radar echo image and tracked target symbols do
not match exactly.
1. Different gyro value at radar overlay and at ECDIS.
2. Improper installation parameters (radar overlay bearing offset, radar overlay
range offset, conning position offset).
The example below shows how different gyro value set at radar overlay and at ECDIS
affect the display of the ECDIS.
Different gyro value at
radar and ECDIS
Equal gyro value at
radar and ECDIS
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