Change over to Hand steering for steering with a magnetic compass with applying Compass deviation value.
Consider the effect of Gyro failure on other navigational and communication equipment which has a gyro feed especially Radar/ ARPA and ECDIS, provide headings manually.
Plot positions more frequently to confirm the course is correct and accordingly allow correction to course steered. In coastal waters, make good use of parallel indexing technique to keep the vessel on charted track.
Secure a True course run (Course made good) by plotting GPS position and verify with Heading of a Magnetic compass.