4.4 Heading output
All displays and outputs of heading should indicate true heading. An indication of any deviation and variation applied to compensate the heading should be capable of being displayed or included in the output.
4.5 Interfaces
The TMHD should be so designed to transmit heading information to other equipment. At least one output should be in accordance with the relevant international marine interface standard.*
5 PERFORMANCE
The following performance standards are required to be achieved under the conditions of a value of 18 μT of the horizontal component of the geomagnetic field and the environmental conditions experienced on board ships.**
5.1 Accuracy of heading
5.1.1 Static
The static accuracy of the heading indication should be within ± 1.0°,
5.1.2 Dynamic
The dynamic accuracy of the heading indication or output should be within ± 1.5°in addition
to the static accuracy as defined. Periods of oscillation of the error shall not be shorter than 30 s under the conditions of various sea states and ship's motion likely to be experienced in ships.***
5.2 Follow-up accuracy of the transmission system
The follow-up accuracy of the transmission system should be within ± 1.5°, when the sensor is rotated at a rate of 20°/S.
* IEC 61162
** IEC 60945
*** IEC 721-3-6
