If the magnetic heading exceeds the compass heading, the deviation is indicated as what?

When the magnetic heading exceeds the compass heading, the deviation is indicated as east. This means that the compass reading, which is the heading indicated by the magnetic compass aboard the vessel, is showing a lower value than the actual magnetic heading of the vessel. This discrepancy occurs because the compass is not perfectly aligned with magnetic north due to various magnetic influences and errors (known as deviation) inherent in compass operation.

If the magnetic heading is greater than the compass heading, that indicates the compass is reading lower than it should be in relation to the magnetic field present. Since the compass is under-reading, it must be adjusted or compensated for by considering the deviation as east. Therefore, when compensating for the deviation, you would add east to the compass heading to get the magnetic heading, reflecting that it is indeed east of where the compass reading indicates.

Understanding this principle is crucial for navigators as it allows them to make the necessary adjustments for accurate navigation, ensuring safe and efficient travel on the water.