Which of the following is NOT considered when determining gyrocompass error?

Determining gyrocompass error involves evaluating various factors that can affect the accuracy of the gyrocompass readings. The true heading and magnetic declination are significant because they provide necessary references for understanding how the compass aligns with true north and the magnetic north respectively. Gyrocompass heading is also critical since it indicates the direction the vessel is pointing based on the gyrocompass, which needs to be accurate for navigation.

The speed of the ship, however, does not directly influence gyrocompass error. While the ship's speed can affect other navigational elements, such as the vessel's turning radius and the effects of currents or wind on the course over ground, it is not a factor in calculating the gyrocompass error itself. The fundamental operation of the gyrocompass's ability to maintain true north orientation is largely unaffected by the ship's speed. Thus, speed of the ship is rightly identified as not being a consideration when determining gyrocompass error.