添付資料 2
ANNEX 2
DRAFT RECOMMENDATION ON PERFORMANCE STANDARDS FOR MARINE TRANSMITTING MAGNETIC HEADING DEVICES (TMHD)
1 SCOPE
1.1 A TMHD is an electronic device which uses the geomagnetic field to obtain and transmit information about the ship's heading.
1.2 In addition to the general requirements contained in resolution A.694(17)* all marine TMHD equipment should comply with the following minimum requirements.
2 APPLICATION
2.1 A TMHD complying with the requirements contained in this recommendation, can be used to meet the carriage requirements for a suitable device providing heading information contained in Chapter v of the SOLAS Convention.
2.2 In addition such THMD can meet the dynamic requirements contained in the HSC Code chapter 13 for the carriage of a suitable device providing heading information.
3 COMPOSITION
Transmitting magnetic heading devices (TMHD) may comprise of：
.1 standard magnetic compass equipped with a magnetic sensor and electronics for generating a suitable output signal for other devices. The compass used should be the standard magnetic compass provided under SOLAS chapter v; or
.2 an electromagmetic compass consisting of the sensor part and electronics for generating a suitable output signal for other devices; or
.3 any type as defined under .1 and .2 additionally equipped with a rate gyro to improve dynamic performance.
4 CONSTRUCTION'
4.1 Fore-and-aft mark
4.1.1 A fore-and-aft mark should be inscribed on the magnetic sensor housing, which should be installed in parallel to the ship's fore-and-aft line.
* See also IEC 60945
