One can easily observe compass deviation when using the first method because it is simply the difference between the compass reading and the known magnetic heading of the ship. The difficulty in using this method lies in placing the ship on the desired magnetic heading and holding the ship steady on that heading while adjustments are being made.

The difficulty in using the second method lies in the determining deviation. Further difficulty arises because the helmsman steers by an uncorrected compass whose deviations are changing while the technician is making the necessary adjustments. Therefore, as each adjustment is being made, the helmsman should hold the ship's heading steady by some means other than the compass that is being corrected.

If the compass has no appreciable deviation, the deviation taken on compass headings will closely approximate those taken on magnetic headings. However, as the magnitude of errors increases, there will be a marked difference between the deviations taken on compass headings and those taken on magnetic headings.

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