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Finding Gyro Error

While your vessel is proceeding down the channel you notice a range of lights in line with your vessel's mast. If your vessel is on course 001° per gyro compass and the charted value of the range lights is 359° True, find your gyro compass error.

Solving for Gyro Error:

Normally gyro compass points to the true north. However, there are times when it does not coincide with true if you compare gyro to the chart. So there must be a gyro error, and that's what we are going to solve in here.

Gyro error = 001° - 359°
                 = 2° West         (west because the gyro reading is greater)

"Compass best, error west"
"Compass least, error east"






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