on 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.

ART. 18. When two steam vessels are meeting end on or nearly end on, so
as to involve risk of collision, each shall alter her course to
starboard, so that each may pass on the port side of the other.

This article only applies to cases where vessels are meeting end on or
nearly end on in such a manner as to involve risk of collision, and does
not apply to two vessels which must if both keep on their respective
courses pass clear of each other.

The only cases to which it does apply are when each of the two vessels
is end on or nearly end on to the other; in other words, to cases in
which by day each vessel sees the masts of the other in a line or nearly
in a line with her own, and by night to cases in which each vessel is in
such a position as to see both the side lights of the other.

It does not apply by day to cases in which a vessel sees another ahead
crossing her own course, or by night to cases where the red light of one
vessel is opposed to the red light of the other, or where the green
light of one vessel is opposed to the green light of the other, or where
a red light without a green light or a green light without a red light
is seen ahead, or where both green and red lights are seen anywhere but
ahead.

ART. 19. When two steam vesse