The large magnets, as originally placed in their positions, have never been moved, neither has the compass been changed in the slightest degree. But although they have greatly _modified_ the errors, they have by no means sufficed to correct them. It has been always found the safest course not to put faith in the compasses at all; or rather, in this instance, observation showed that a compass, suspended in a box from a cross spar, at the height of ten or twelve feet above the head of the man at the helm, acted with much more accuracy than any other, and it was always the most relied on whenever it could be used. It is scarcely to be doubted that the vessel has often made a longer passage than she would have done had the compasses been correct; for, in bad weather, when observations of the celestial bodies could not be taken, she could scarcely have avoided making many errors in her course. But nowhere were these difficulties felt more anxiously than in this passage through the Mozambique Channel, where land could never be very far distant. The necessity for a constant good look-out, and for two or even three men in the chains, produced anxiety and fatigue in itself; while it was also necessary for the officers to have the advantage of taking the altitudes of the stars, whenever the night was clear enough, not only once, but many times during the night. The compasses not only differed from the true points, but differed also from each other; and particularly in the Mozambique Channel, it was observed that they differed more than elsewhere, without being influenced however by the rapid atmospheric changes which prevailed. The more the ship's course was directed towards the true pole, the less was the error of the compass; but gradually, as her course was changed towards the east or west, so did the errors and discrepancies of the compasses increase. It is satisfactory to know that the same degree of difficulty was not experienced on board the other iron steamers which were sent out afterwards; and as the Nemesis was the first of her class that ever made the voyage, it is right here to record the difficulties she encountered under this head. Many an anxious watch has been spent on deck, trying to catch the altitude of particular stars as they emerged, for a moment, from the dense clouds or haze; and much of this kind of labour, so frequently repeated, would have been saved had her compasses been trustworthy.[9]