DEVIATION.--The master must not deviate from the course of the voyage. By a _deviation_ is meant, technically, any alteration of the risk insured against, without necessity or reasonable cause. It may be by departing from the regular and usual course of the voyage, or by any unusual and unnecessary delay. A deviation renders the insurance void, whether the loss of the vessel is caused by the deviation or not. It is not a deviation to make a port for repairs or supplies, if there be no unnecessary delay, nor to depart from the course of the voyage in order to succor persons in distress, to avoid an enemy, or the like. It is the master's duty, within twenty-four hours after arriving at his first port, to make a _protest_ in case of any accident or loss happening to vessel or cargo. The log-book also should be carefully kept, without interlineations or erasures. The master must also enter a protest in case any American seaman is impressed, and transmit a copy of the same to the secretary of state, under a penalty of $100.[59] [59] Act 1796, ch. 36, §5. COLLISION.--A vessel having the wind free must make way for a vessel close-hauled. The general practice is, that when two vessels approach each other, both having a free or fair wind, the one with the starboard tacks aboard keeps on her course, or, if any change is made, she luffs, so as to pass to windward of the other; or, in other words, each vessel passes to the right. This rule should also govern vessels sailing on the wind and approaching each other, when it is doubtful which is to windward. But if the vessel on the larboard tack is so far to windward that if both persist in their course the other will strike her on the lee side, abaft the beam, or near the stern; in such case, the vessel on the starboard tack must give way, as she can do so with less loss of time and greater facility than the other. These rules are particularly intended to govern vessels approaching each other under circumstances that prevent their course and movements being readily discerned with accuracy, as at night or in a fog. At other times, circumstances may render it expedient to depart from them. A steamer is considered as always sailing with a fair wind, and is bound to do whatever would be required of a vessel going free.[60] [60] Report of Benjamin Rich and others to District Court of Mass. PILOT.--The master must take a pilot when within the usual limits of the pilot's employment.[61] If he neglects or refuses so to do, he becomes liable to the owners, freighters, and insurers. If no pilot is at hand, he must make signals, and wait a reasonable time. The master is to be justified in entering port without a pilot only by extreme necessity. After the pilot is on board, the master has no more control over the working of the ship until she is at anchor.[62] [61] 6 Rob. 316. 7 T. R. 160. [62] 2 B. & Ad. 380. 3 Kent's Com. 175 c.