Gyro fail in Singapore strait. Gyro compass failure and action

Effect of gyro fail in Singapore strait:
Malfunction of any connected equipment.
Gyro repeater will not work.
Auto pilot will not work.
AIS will not show correct heading.
VDR will not record correct heading.
Radar picture change. Target course speed change.
ECDIS malfunction.

Equipment that can be affected:
Gyro repeater, Auto pilot, AIS, Radar, ECDIS, VDR.

Actions in case of gyro compass failure (in Singapore strait):
Inform master.
Inform engine room.
Hand steering.
Reduce speed.
Use Second gyro if any.
Use Magnetic compass.
Plot position frequently.
Inform Singapore VTS.
Broadcast safety message to nearby ships.
Proper light and sound signal.
Contingency anchorage.