INS Messages

Depending on the manufacturer, protocol version implementation, or for other reasons, INS may not support or perform data integrity and reliability assessment.

INS Warnings (for all data types)

Text	Category	Condition
Sensor malfunction <INS>	Alarm	When data from the sensor stops being received according to the configurable timeout
Heading unreliable	Warning	Displayed in the alarm, warning, and caution area
Integrity of <parameter name> violated	Warning	Displayed in the alarm, warning, and caution area
Integrity of <parameter name> doubtful	Warning	Displayed in the alarm, warning, and caution area
<parameter name> unreliable	Warning	Displayed in the alarm, warning, and caution area

Important

The navigator’s response to INS warnings is determined by prevailing conditions and circumstances.

Additionally, the vessel speed generation mode is transmitted in the $INNSR sentence, which is displayed in the STW row of the Navigational Panel:

• Normal operating mode (Auto) — speed is determined based on direct measurements from the water-referenced speed sensor. The speed value is displayed without additional markings

• Estimated mode (Estimated) — speed is calculated without direct water-referenced measurements (e.g., via GNSS or inertial navigation). The system automatically marks such data to inform the navigator

• Manual input (Manual) — speed is entered manually from the INS control panel. Used when speed sensors fail or under special navigation conditions

Note

When operating in Estimated or Manual mode, it is recommended to regularly verify speed readings with alternative sources to ensure data accuracy.