3. You are steering 142°pgc to make good your desired course. The gyro error is 1°E. The variation is 8°W. What should you steer by standard magnetic compass to make good the desired course?

DEVIATION TABLE
Magnetic Heading Deviation
120° 4°E
135° 2°E
150° 0

To determine the standard magnetic compass course, first correct the gyro course for gyro error, then for variation, and finally apply deviation from the provided table. The gyro course of 142pgc, with a 1E gyro error, becomes 143T. Applying the 8W variation yields a magnetic course of 151M. Consulting the deviation table, the deviation at 150M is 0, therefore the standard magnetic compass course is 151psc.