Supra SL Owner's Manual page 29

When two power-driven vessels are crossing each other's path
close enough to run the risk of collision, the vessel that views
the crossing vessel to the starboard (right) side must give-way.
If the other vessel is to the port (left) side, maintain your course
and direction, provided the other vessel gives you the right-
of-way as it should.
If you are passing another vessel, you are the give-way vessel.
This means that the other vessel is expected to maintain its
course and speed. You must stay out of its way as you clear it,
altering course and speed as necessary.
Conversely, if you are being passed by another vessel, you
should maintain your speed and direction so that the other
vessel can steer itself around you.
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There are three other rules to always remember when driving your
boat around other vessels.
When navigating in narrow channels, you should keep to the right
when it is safe and practical to do so. If the operator of a power-
driven vessel is preparing to go around a bend that may obstruct
the view of other water vessels, the operator should sound a
prolonged blast on the whistle or horn—four to six seconds.
If another vessel is around the bend, it too should sound the
whistle or horn. Even if no reply is heard, however, the vessel
should still proceed around the bend with caution.
If you navigate these type of waters, you should carry a portable
air horn, which are available from local marine supply stores.
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