RECIPROCAL: A course diametrically opposed to it’s predecessor, found by adding or subtracting 180 degrees thus, the reciprocal of 90 degrees is 270 degrees, while the reciprocal of 330 degrees becomes 150 degrees.
reciprocal - A bearing 180° from the other. A direction directly opposite the original direction.
reciprocal - The opposite direction; difference of 180 degrees.
reef - Reducing the exposed area of a sail, by rolling the sail on a boom or by gathering the bottom of the sail and tying in reef points.
reciprocal course
The course opposite to the current course, or 180 degrees in the other direction. See Williamson turn.
red sector ...
Interchange
Reciprocal exchange of e.g. information between two or more parties.
Two vessels meeting on near-reciprocal courses would close relatively rapidly, because their closing speed would be the sum of the two speeds. The risk of collision would arise while while they were still relatively far apart.
W X GM' The reciprocal of this quantity or 2240 Wxgm Ala is a measure of the capability of the ship to stand up under her canvas and is termed the power to carry sail. Its value varies with different sizes and classes of ships and boats.
While there is no formal reciprocal recognition of RYA Yacht Master or OUPV certificates, the UK has recently instituted a Certificate of Equivalent Competency for USCG Mate Oceans up to 1600 tons ratings and above.
(a) When two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision each shall alter her course to starboard so that each shall pass on the port side of the other.
 See also: Navigation, Lines, Reach, Rudder, After
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