A steam vessel hearing, apparently forward of her beam, the fog signal of a vessel the position of which is not ascertained shall, so far as the circumstances of the case admit, stop her engines and then navigate with caution until danger of collision is over.
STEERING AND SAILING RULES.
PRELIMINARY.—RISK OF COLLISION.
Risk of collision can, when circumstances permit, be ascertained by carefully watching the compass bearing of an approaching vessel. If the bearing does not appreciably change, such risk should be deemed to exist.
ART. 17. When two sailing vessels are approaching one another so as to involve risk of collision, one of them shall keep out of the way of the other as follows, namely:
(a) A vessel which is running free shall keep out of the way of a vessel which is closehauled.
(b) A vessel which is closehauled on the port tack shall keep out of the way of a vessel which is closehauled on the starboard tack.
(c) When both are running free with the wind on different sides, the vessel which has the wind on the port side shall keep out of the way of the other.
(d) When both are running free with the wind on the same side, the vessel which is to the windward shall keep out of the way of the vessel which is to leeward.
(e) A vessel which has the wind aft shall keep out of the way of the other vessel.